zulip/zerver/tests/test_events.py

# -*- coding: utf-8 -*-
# See https://zulip.readthedocs.io/en/latest/subsystems/events-system.html for
# high-level documentation on how this system works.
from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Union
import os
import shutil
import sys

from django.conf import settings
from django.http import HttpRequest, HttpResponse
from django.test import TestCase
from django.utils.timezone import now as timezone_now
from io import StringIO

from zerver.models import (
    get_client, get_realm, get_stream_recipient, get_stream, get_user,
    Message, RealmDomain, Recipient, UserMessage, UserPresence, UserProfile,
    Realm, Subscription, Stream, flush_per_request_caches, UserGroup, Service,
    Attachment, PreregistrationUser,
)

from zerver.lib.actions import (
    try_update_realm_custom_profile_field,
    bulk_add_subscriptions,
    bulk_remove_subscriptions,
    check_add_realm_emoji,
    check_send_message,
    check_send_typing_notification,
    do_add_alert_words,
    do_add_default_stream,
    do_add_reaction,
    do_add_reaction_legacy,
    do_add_realm_domain,
    do_add_realm_filter,
    do_add_streams_to_default_stream_group,
    do_add_submessage,
    do_change_avatar_fields,
    do_change_bot_owner,
    do_change_default_all_public_streams,
    do_change_default_events_register_stream,
    do_change_default_sending_stream,
    do_change_default_stream_group_description,
    do_change_default_stream_group_name,
    do_change_full_name,
    do_change_icon_source,
    do_change_is_admin,
    do_change_notification_settings,
    do_change_realm_domain,
    do_change_stream_description,
    do_change_subscription_property,
    do_create_user,
    do_create_default_stream_group,
    do_deactivate_stream,
    do_deactivate_user,
    do_delete_message,
    do_invite_users,
    do_mark_hotspot_as_read,
    do_mute_topic,
    do_reactivate_user,
    do_regenerate_api_key,
    do_remove_alert_words,
    do_remove_default_stream,
    do_remove_default_stream_group,
    do_remove_reaction,
    do_remove_reaction_legacy,
    do_remove_realm_domain,
    do_remove_realm_emoji,
    do_remove_realm_filter,
    do_remove_streams_from_default_stream_group,
    do_rename_stream,
    do_revoke_user_invite,
    do_set_realm_authentication_methods,
    do_set_realm_message_editing,
    do_set_realm_property,
    do_set_user_display_setting,
    do_set_realm_notifications_stream,
    do_set_realm_signup_notifications_stream,
    do_unmute_topic,
    do_update_embedded_data,
    do_update_message,
    do_update_message_flags,
    do_update_outgoing_webhook_service,
    do_update_pointer,
    do_update_user_presence,
    get_typing_user_profiles,
    log_event,
    lookup_default_stream_groups,
    notify_attachment_update,
    notify_realm_custom_profile_fields,
    check_add_user_group,
    do_update_user_group_name,
    do_update_user_group_description,
    bulk_add_members_to_user_group,
    remove_members_from_user_group,
    check_delete_user_group,
    do_update_user_custom_profile_data,
)
from zerver.lib.events import (
    apply_events,
    fetch_initial_state_data,
)
from zerver.lib.message import (
    aggregate_unread_data,
    get_raw_unread_data,
    render_markdown,
    UnreadMessagesResult,
)
from zerver.lib.test_helpers import POSTRequestMock, get_subscription, \
    get_test_image_file, stub_event_queue_user_events, queries_captured
from zerver.lib.test_classes import (
    ZulipTestCase,
)
from zerver.lib.test_runner import slow
from zerver.lib.topic_mutes import (
    add_topic_mute,
)
from zerver.lib.validator import (
    check_bool, check_dict, check_dict_only, check_float, check_int, check_list, check_string,
    equals, check_none_or, Validator, check_url
)
from zerver.lib.upload import upload_backend, attachment_url_to_path_id
from zerver.lib.users import get_api_key

from zerver.views.events_register import _default_all_public_streams, _default_narrow

from zerver.tornado.event_queue import (
    allocate_client_descriptor,
    clear_client_event_queues_for_testing,
    get_client_info_for_message_event,
    process_message_event,
    EventQueue,
)
from zerver.tornado.views import get_events

from collections import OrderedDict
import mock
import time
import ujson


class LogEventsTest(ZulipTestCase):
    def test_with_missing_event_log_dir_setting(self) -> None:
        with self.settings(EVENT_LOG_DIR=None):
            log_event(dict())

    def test_log_event_mkdir(self) -> None:
        dir_name = 'var/test-log-dir'

        try:
            shutil.rmtree(dir_name)
        except OSError:  # nocoverage
            # assume it doesn't exist already
            pass

        self.assertFalse(os.path.exists(dir_name))
        with self.settings(EVENT_LOG_DIR=dir_name):
            event = {}  # type: Dict[str, int]
            log_event(event)
        self.assertTrue(os.path.exists(dir_name))


class EventsEndpointTest(ZulipTestCase):
    def test_events_register_endpoint(self) -> None:

        # This test is intended to get minimal coverage on the
        # events_register code paths
        email = self.example_email("hamlet")
        with mock.patch('zerver.views.events_register.do_events_register', return_value={}):
            result = self.api_post(email, '/json/register')
        self.assert_json_success(result)

        with mock.patch('zerver.lib.events.request_event_queue', return_value=None):
            result = self.api_post(email, '/json/register')
        self.assert_json_error(result, "Could not allocate event queue")

        return_event_queue = '15:11'
        return_user_events = []  # type: (List[Any])

        # Test that call is made to deal with a returning soft deactivated user.
        with mock.patch('zerver.lib.events.maybe_catch_up_soft_deactivated_user') as fa:
            with stub_event_queue_user_events(return_event_queue, return_user_events):
                result = self.api_post(email, '/json/register', dict(event_types=ujson.dumps(['pointer'])))
                self.assertEqual(fa.call_count, 1)

        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(email, '/json/register', dict(event_types=ujson.dumps(['pointer'])))
        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict['last_event_id'], -1)
        self.assertEqual(result_dict['queue_id'], '15:11')

        return_event_queue = '15:12'
        return_user_events = [
            {
                'id': 6,
                'type': 'pointer',
                'pointer': 15,
            }
        ]
        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(email, '/json/register', dict(event_types=ujson.dumps(['pointer'])))

        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict['last_event_id'], 6)
        self.assertEqual(result_dict['pointer'], 15)
        self.assertEqual(result_dict['queue_id'], '15:12')

        # Now test with `fetch_event_types` not matching the event
        return_event_queue = '15:13'
        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(email, '/json/register',
                                   dict(event_types=ujson.dumps(['pointer']),
                                        fetch_event_types=ujson.dumps(['message'])))
        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict['last_event_id'], 6)
        # Check that the message event types data is in there
        self.assertIn('max_message_id', result_dict)
        # Check that the pointer event types data is not in there
        self.assertNotIn('pointer', result_dict)
        self.assertEqual(result_dict['queue_id'], '15:13')

        # Now test with `fetch_event_types` matching the event
        with stub_event_queue_user_events(return_event_queue, return_user_events):
            result = self.api_post(email, '/json/register',
                                   dict(fetch_event_types=ujson.dumps(['pointer']),
                                        event_types=ujson.dumps(['message'])))
        self.assert_json_success(result)
        result_dict = result.json()
        self.assertEqual(result_dict['last_event_id'], 6)
        # Check that we didn't fetch the messages data
        self.assertNotIn('max_message_id', result_dict)
        # Check that the pointer data is in there, and is correctly
        # updated (presering our atomicity guaranteed), though of
        # course any future pointer events won't be distributed
        self.assertIn('pointer', result_dict)
        self.assertEqual(result_dict['pointer'], 15)
        self.assertEqual(result_dict['queue_id'], '15:13')

    def test_tornado_endpoint(self) -> None:

        # This test is mostly intended to get minimal coverage on
        # the /notify_tornado endpoint, so we can have 100% URL coverage,
        # but it does exercise a little bit of the codepath.
        post_data = dict(
            data=ujson.dumps(
                dict(
                    event=dict(
                        type='other'
                    ),
                    users=[self.example_user('hamlet').id],
                ),
            ),
        )
        req = POSTRequestMock(post_data, user_profile=None)
        req.META['REMOTE_ADDR'] = '127.0.0.1'
        result = self.client_post_request('/notify_tornado', req)
        self.assert_json_error(result, 'Access denied', status_code=403)

        post_data['secret'] = settings.SHARED_SECRET
        req = POSTRequestMock(post_data, user_profile=None)
        req.META['REMOTE_ADDR'] = '127.0.0.1'
        result = self.client_post_request('/notify_tornado', req)
        self.assert_json_success(result)

class GetEventsTest(ZulipTestCase):
    def tornado_call(self, view_func: Callable[[HttpRequest, UserProfile], HttpResponse],
                     user_profile: UserProfile,
                     post_data: Dict[str, Any]) -> HttpResponse:
        request = POSTRequestMock(post_data, user_profile)
        return view_func(request, user_profile)

    def test_get_events(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        recipient_user_profile = self.example_user('othello')
        recipient_email = recipient_user_profile.email
        self.login(email)

        result = self.tornado_call(get_events, user_profile,
                                   {"apply_markdown": ujson.dumps(True),
                                    "client_gravatar": ujson.dumps(True),
                                    "event_types": ujson.dumps(["message"]),
                                    "user_client": "website",
                                    "dont_block": ujson.dumps(True),
                                    })
        self.assert_json_success(result)
        queue_id = ujson.loads(result.content)["queue_id"]

        recipient_result = self.tornado_call(get_events, recipient_user_profile,
                                             {"apply_markdown": ujson.dumps(True),
                                              "client_gravatar": ujson.dumps(True),
                                              "event_types": ujson.dumps(["message"]),
                                              "user_client": "website",
                                              "dont_block": ujson.dumps(True),
                                              })
        self.assert_json_success(recipient_result)
        recipient_queue_id = ujson.loads(recipient_result.content)["queue_id"]

        result = self.tornado_call(get_events, user_profile,
                                   {"queue_id": queue_id,
                                    "user_client": "website",
                                    "last_event_id": -1,
                                    "dont_block": ujson.dumps(True),
                                    })
        events = ujson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 0)

        local_id = '10.01'
        check_send_message(
            sender=user_profile,
            client=get_client('whatever'),
            message_type_name='private',
            message_to=[recipient_email],
            topic_name=None,
            message_content='hello',
            local_id=local_id,
            sender_queue_id=queue_id,
        )

        result = self.tornado_call(get_events, user_profile,
                                   {"queue_id": queue_id,
                                    "user_client": "website",
                                    "last_event_id": -1,
                                    "dont_block": ujson.dumps(True),
                                    })
        events = ujson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 1)
        self.assertEqual(events[0]["type"], "message")
        self.assertEqual(events[0]["message"]["sender_email"], email)
        self.assertEqual(events[0]["local_message_id"], local_id)
        self.assertEqual(events[0]["message"]["display_recipient"][0]["is_mirror_dummy"], False)
        self.assertEqual(events[0]["message"]["display_recipient"][1]["is_mirror_dummy"], False)

        last_event_id = events[0]["id"]
        local_id = '10.02'

        check_send_message(
            sender=user_profile,
            client=get_client('whatever'),
            message_type_name='private',
            message_to=[recipient_email],
            topic_name=None,
            message_content='hello',
            local_id=local_id,
            sender_queue_id=queue_id,
        )

        result = self.tornado_call(get_events, user_profile,
                                   {"queue_id": queue_id,
                                    "user_client": "website",
                                    "last_event_id": last_event_id,
                                    "dont_block": ujson.dumps(True),
                                    })
        events = ujson.loads(result.content)["events"]
        self.assert_json_success(result)
        self.assert_length(events, 1)
        self.assertEqual(events[0]["type"], "message")
        self.assertEqual(events[0]["message"]["sender_email"], email)
        self.assertEqual(events[0]["local_message_id"], local_id)

        # Test that the received message in the receiver's event queue
        # exists and does not contain a local id
        recipient_result = self.tornado_call(get_events, recipient_user_profile,
                                             {"queue_id": recipient_queue_id,
                                              "user_client": "website",
                                              "last_event_id": -1,
                                              "dont_block": ujson.dumps(True),
                                              })
        recipient_events = ujson.loads(recipient_result.content)["events"]
        self.assert_json_success(recipient_result)
        self.assertEqual(len(recipient_events), 2)
        self.assertEqual(recipient_events[0]["type"], "message")
        self.assertEqual(recipient_events[0]["message"]["sender_email"], email)
        self.assertTrue("local_message_id" not in recipient_events[0])
        self.assertEqual(recipient_events[1]["type"], "message")
        self.assertEqual(recipient_events[1]["message"]["sender_email"], email)
        self.assertTrue("local_message_id" not in recipient_events[1])

    def test_get_events_narrow(self) -> None:
        user_profile = self.example_user('hamlet')
        email = user_profile.email
        self.login(email)

        def get_message(apply_markdown: bool, client_gravatar: bool) -> Dict[str, Any]:
            result = self.tornado_call(
                get_events,
                user_profile,
                dict(
                    apply_markdown=ujson.dumps(apply_markdown),
                    client_gravatar=ujson.dumps(client_gravatar),
                    event_types=ujson.dumps(["message"]),
                    narrow=ujson.dumps([["stream", "denmark"]]),
                    user_client="website",
                    dont_block=ujson.dumps(True),
                )
            )

            self.assert_json_success(result)
            queue_id = ujson.loads(result.content)["queue_id"]

            result = self.tornado_call(get_events, user_profile,
                                       {"queue_id": queue_id,
                                        "user_client": "website",
                                        "last_event_id": -1,
                                        "dont_block": ujson.dumps(True),
                                        })
            events = ujson.loads(result.content)["events"]
            self.assert_json_success(result)
            self.assert_length(events, 0)

            self.send_personal_message(email, self.example_email("othello"), "hello")
            self.send_stream_message(email, "Denmark", "**hello**")

            result = self.tornado_call(get_events, user_profile,
                                       {"queue_id": queue_id,
                                        "user_client": "website",
                                        "last_event_id": -1,
                                        "dont_block": ujson.dumps(True),
                                        })
            events = ujson.loads(result.content)["events"]
            self.assert_json_success(result)
            self.assert_length(events, 1)
            self.assertEqual(events[0]["type"], "message")
            return events[0]['message']

        message = get_message(apply_markdown=False, client_gravatar=False)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "**hello**")
        self.assertIn('gravatar.com', message["avatar_url"])

        message = get_message(apply_markdown=True, client_gravatar=False)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "<p><strong>hello</strong></p>")
        self.assertIn('gravatar.com', message["avatar_url"])

        message = get_message(apply_markdown=False, client_gravatar=True)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "**hello**")
        self.assertEqual(message["avatar_url"], None)

        message = get_message(apply_markdown=True, client_gravatar=True)
        self.assertEqual(message["display_recipient"], "Denmark")
        self.assertEqual(message["content"], "<p><strong>hello</strong></p>")
        self.assertEqual(message["avatar_url"], None)

class EventsRegisterTest(ZulipTestCase):
    def setUp(self) -> None:
        super().setUp()
        self.user_profile = self.example_user('hamlet')

    def create_bot(self, email: str, **extras: Any) -> Optional[UserProfile]:
        return self.create_test_bot(email, self.user_profile, **extras)

    def realm_bot_schema(self, field_name: str, check: Validator) -> Validator:
        return self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('update')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                (field_name, check),
            ])),
        ])

    def do_test(self, action: Callable[[], Any], event_types: Optional[List[str]]=None,
                include_subscribers: bool=True, state_change_expected: bool=True,
                client_gravatar: bool=False, num_events: int=1) -> List[Dict[str, Any]]:
        '''
        Make sure we have a clean slate of client descriptors for these tests.
        If we don't do this, then certain failures will only manifest when you
        run multiple tests within a single test function.
        '''
        clear_client_event_queues_for_testing()

        client = allocate_client_descriptor(
            dict(user_profile_id = self.user_profile.id,
                 user_profile_email = self.user_profile.email,
                 realm_id = self.user_profile.realm_id,
                 event_types = event_types,
                 client_type_name = "website",
                 apply_markdown = True,
                 client_gravatar = client_gravatar,
                 all_public_streams = False,
                 queue_timeout = 600,
                 last_connection_time = time.time(),
                 narrow = [])
        )
        # hybrid_state = initial fetch state + re-applying events triggered by our action
        # normal_state = do action then fetch at the end (the "normal" code path)
        hybrid_state = fetch_initial_state_data(
            self.user_profile, event_types, "",
            client_gravatar=True,
            include_subscribers=include_subscribers
        )
        action()
        events = client.event_queue.contents()
        self.assertTrue(len(events) == num_events)

        before = ujson.dumps(hybrid_state)
        apply_events(hybrid_state, events, self.user_profile,
                     client_gravatar=True, include_subscribers=include_subscribers)
        after = ujson.dumps(hybrid_state)

        if state_change_expected:
            if before == after:
                print(events)  # nocoverage
                raise AssertionError('Test does not exercise enough code -- events do not change state.')
        else:
            if before != after:
                raise AssertionError('Test is invalid--state actually does change here.')

        normal_state = fetch_initial_state_data(
            self.user_profile, event_types, "",
            client_gravatar=True,
            include_subscribers=include_subscribers
        )
        self.match_states(hybrid_state, normal_state, events)
        return events

    def assert_on_error(self, error: Optional[str]) -> None:
        if error:
            raise AssertionError(error)

    def match_states(self, state1: Dict[str, Any], state2: Dict[str, Any],
                     events: List[Dict[str, Any]]) -> None:
        def normalize(state: Dict[str, Any]) -> None:
            for u in state['never_subscribed']:
                if 'subscribers' in u:
                    u['subscribers'].sort()
            for u in state['subscriptions']:
                if 'subscribers' in u:
                    u['subscribers'].sort()
            state['subscriptions'] = {u['name']: u for u in state['subscriptions']}
            state['unsubscribed'] = {u['name']: u for u in state['unsubscribed']}
            if 'realm_bots' in state:
                state['realm_bots'] = {u['email']: u for u in state['realm_bots']}
        normalize(state1)
        normalize(state2)

        # If this assertions fails, we have unusual problems.
        self.assertEqual(state1.keys(), state2.keys())

        # The far more likely scenario is that some section of
        # our enormous payload does not get updated properly.  We
        # want the diff here to be developer-friendly, hence
        # the somewhat tedious code to provide useful output.
        if state1 != state2:  # nocoverage
            print('\n---States DO NOT MATCH---')
            print('\nEVENTS:\n')

            # Printing out the events is a big help to
            # developers.
            import json
            for event in events:
                print(json.dumps(event, indent=4))

            print('\nMISMATCHES:\n')
            for k in state1:
                if state1[k] != state2[k]:
                    print('\nkey = ' + k)
                    try:
                        self.assertEqual({k: state1[k]}, {k: state2[k]})
                    except AssertionError as e:
                        print(e)
            print('''
                NOTE:

                    This is an advanced test that verifies how
                    we apply events after fetching data.  If you
                    do not know how to debug it, you can ask for
                    help on chat.
                ''')

            sys.stdout.flush()
            raise AssertionError('Mismatching states')

    def check_events_dict(self, required_keys: List[Tuple[str, Validator]]) -> Validator:
        required_keys.append(('id', check_int))
        # Raise AssertionError if `required_keys` contains duplicate items.
        keys = [key[0] for key in required_keys]
        self.assertEqual(len(keys), len(set(keys)), 'Duplicate items found in required_keys.')
        return check_dict_only(required_keys)

    def test_mentioned_send_message_events(self) -> None:
        user = self.example_user('hamlet')

        for i in range(3):
            content = 'mentioning... @**' + user.full_name + '** hello ' + str(i)
            self.do_test(
                lambda: self.send_stream_message(self.example_email('cordelia'),
                                                 "Verona",
                                                 content)

            )

    def test_pm_send_message_events(self) -> None:
        self.do_test(
            lambda: self.send_personal_message(self.example_email('cordelia'),
                                               self.example_email('hamlet'),
                                               'hola')

        )

    def test_huddle_send_message_events(self) -> None:
        huddle = [
            self.example_email('hamlet'),
            self.example_email('othello'),
        ]
        self.do_test(
            lambda: self.send_huddle_message(self.example_email('cordelia'),
                                             huddle,
                                             'hola')

        )

    def test_stream_send_message_events(self) -> None:
        def check_none(var_name: str, val: Any) -> Optional[str]:
            assert(val is None)
            return None

        def get_checker(check_gravatar: Validator) -> Validator:
            schema_checker = self.check_events_dict([
                ('type', equals('message')),
                ('flags', check_list(None)),
                ('message', self.check_events_dict([
                    ('avatar_url', check_gravatar),
                    ('client', check_string),
                    ('content', check_string),
                    ('content_type', equals('text/html')),
                    ('display_recipient', check_string),
                    ('is_me_message', check_bool),
                    ('reactions', check_list(None)),
                    ('recipient_id', check_int),
                    ('sender_realm_str', check_string),
                    ('sender_email', check_string),
                    ('sender_full_name', check_string),
                    ('sender_id', check_int),
                    ('sender_short_name', check_string),
                    ('stream_id', check_int),
                    ('subject', check_string),
                    ('subject_links', check_list(None)),
                    ('submessages', check_list(None)),
                    ('timestamp', check_int),
                    ('type', check_string),
                ])),
            ])
            return schema_checker

        events = self.do_test(
            lambda: self.send_stream_message(self.example_email("hamlet"), "Verona", "hello"),
            client_gravatar=False,
        )
        schema_checker = get_checker(check_gravatar=check_string)
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(
            lambda: self.send_stream_message(self.example_email("hamlet"), "Verona", "hello"),
            client_gravatar=True,
        )
        schema_checker = get_checker(check_gravatar=check_none)
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Verify message editing
        schema_checker = self.check_events_dict([
            ('type', equals('update_message')),
            ('flags', check_list(None)),
            ('content', check_string),
            ('edit_timestamp', check_int),
            ('message_id', check_int),
            ('message_ids', check_list(check_int)),
            ('prior_mention_user_ids', check_list(check_int)),
            ('mention_user_ids', check_list(check_int)),
            ('presence_idle_user_ids', check_list(check_int)),
            ('stream_push_user_ids', check_list(check_int)),
            ('stream_email_user_ids', check_list(check_int)),
            ('push_notify_user_ids', check_list(check_int)),
            ('orig_content', check_string),
            ('orig_rendered_content', check_string),
            ('orig_subject', check_string),
            ('prev_rendered_content_version', check_int),
            ('propagate_mode', check_string),
            ('rendered_content', check_string),
            ('sender', check_string),
            ('stream_id', check_int),
            ('stream_name', check_string),
            ('subject', check_string),
            ('subject_links', check_list(None)),
            ('user_id', check_int),
            ('is_me_message', check_bool),
        ])

        message = Message.objects.order_by('-id')[0]
        topic = 'new_topic'
        propagate_mode = 'change_all'
        content = 'new content'
        rendered_content = render_markdown(message, content)
        prior_mention_user_ids = set()  # type: Set[int]
        mentioned_user_ids = set()  # type: Set[int]

        events = self.do_test(
            lambda: do_update_message(self.user_profile, message, topic,
                                      propagate_mode, content, rendered_content,
                                      prior_mention_user_ids,
                                      mentioned_user_ids),
            state_change_expected=True,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Verify do_update_embedded_data
        schema_checker = self.check_events_dict([
            ('type', equals('update_message')),
            ('flags', check_list(None)),
            ('content', check_string),
            ('message_id', check_int),
            ('message_ids', check_list(check_int)),
            ('rendered_content', check_string),
            ('sender', check_string),
        ])

        events = self.do_test(
            lambda: do_update_embedded_data(self.user_profile, message,
                                            u"embed_content", "<p>embed_content</p>"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_update_message_flags(self) -> None:
        # Test message flag update events
        schema_checker = self.check_events_dict([
            ('all', check_bool),
            ('type', equals('update_message_flags')),
            ('flag', check_string),
            ('messages', check_list(check_int)),
            ('operation', equals("add")),
        ])

        message = self.send_personal_message(
            self.example_email("cordelia"),
            self.example_email("hamlet"),
            "hello",
        )
        user_profile = self.example_user('hamlet')
        events = self.do_test(
            lambda: do_update_message_flags(user_profile, get_client("website"), 'add', 'starred', [message]),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)
        schema_checker = self.check_events_dict([
            ('all', check_bool),
            ('type', equals('update_message_flags')),
            ('flag', check_string),
            ('messages', check_list(check_int)),
            ('operation', equals("remove")),
        ])
        events = self.do_test(
            lambda: do_update_message_flags(user_profile, get_client("website"), 'remove', 'starred', [message]),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_update_read_flag_removes_unread_msg_ids(self) -> None:

        user_profile = self.example_user('hamlet')
        mention = '@**' + user_profile.full_name + '**'

        for content in ['hello', mention]:
            message = self.send_stream_message(
                self.example_email('cordelia'),
                "Verona",
                content
            )

            self.do_test(
                lambda: do_update_message_flags(user_profile, get_client("website"), 'add', 'read', [message]),
                state_change_expected=True,
            )

    def test_send_message_to_existing_recipient(self) -> None:
        self.send_stream_message(
            self.example_email('cordelia'),
            "Verona",
            "hello 1"
        )
        self.do_test(
            lambda: self.send_stream_message("cordelia@zulip.com", "Verona", "hello 2"),
            state_change_expected=True,
        )

    def test_add_reaction_legacy(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('reaction')),
            ('op', equals('add')),
            ('message_id', check_int),
            ('emoji_name', check_string),
            ('emoji_code', check_string),
            ('reaction_type', check_string),
            ('user', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int)
            ])),
        ])

        message_id = self.send_stream_message(self.example_email("hamlet"), "Verona", "hello")
        message = Message.objects.get(id=message_id)
        events = self.do_test(
            lambda: do_add_reaction_legacy(
                self.user_profile, message, "tada"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_remove_reaction_legacy(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('reaction')),
            ('op', equals('remove')),
            ('message_id', check_int),
            ('emoji_name', check_string),
            ('emoji_code', check_string),
            ('reaction_type', check_string),
            ('user', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int)
            ])),
        ])

        message_id = self.send_stream_message(self.example_email("hamlet"), "Verona", "hello")
        message = Message.objects.get(id=message_id)
        do_add_reaction_legacy(self.user_profile, message, "tada")
        events = self.do_test(
            lambda: do_remove_reaction_legacy(
                self.user_profile, message, "tada"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_add_reaction(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('reaction')),
            ('op', equals('add')),
            ('message_id', check_int),
            ('emoji_name', check_string),
            ('emoji_code', check_string),
            ('reaction_type', check_string),
            ('user', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int)
            ])),
        ])

        message_id = self.send_stream_message(self.example_email("hamlet"), "Verona", "hello")
        message = Message.objects.get(id=message_id)
        events = self.do_test(
            lambda: do_add_reaction(
                self.user_profile, message, "tada", "1f389", "unicode_emoji"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_add_submessage(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('submessage')),
            ('message_id', check_int),
            ('submessage_id', check_int),
            ('sender_id', check_int),
            ('msg_type', check_string),
            ('content', check_string),
        ])

        cordelia = self.example_user('cordelia')
        stream_name = 'Verona'
        message_id = self.send_stream_message(
            sender_email=cordelia.email,
            stream_name=stream_name,
        )
        events = self.do_test(
            lambda: do_add_submessage(
                sender_id=cordelia.id,
                message_id=message_id,
                msg_type='whatever',
                content='"stuff"',
            ),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_remove_reaction(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('reaction')),
            ('op', equals('remove')),
            ('message_id', check_int),
            ('emoji_name', check_string),
            ('emoji_code', check_string),
            ('reaction_type', check_string),
            ('user', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int)
            ])),
        ])

        message_id = self.send_stream_message(self.example_email("hamlet"), "Verona", "hello")
        message = Message.objects.get(id=message_id)
        do_add_reaction(self.user_profile, message, "tada", "1f389", "unicode_emoji")
        events = self.do_test(
            lambda: do_remove_reaction(
                self.user_profile, message, "1f389", "unicode_emoji"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_invite_user_event(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('invites_changed')),
        ])

        self.user_profile = self.example_user('iago')
        streams = []
        for stream_name in ["Denmark", "Scotland"]:
            streams.append(get_stream(stream_name, self.user_profile.realm))
        events = self.do_test(
            lambda: do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_revoke_user_invite_event(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('invites_changed')),
        ])

        self.user_profile = self.example_user('iago')
        streams = []
        for stream_name in ["Denmark", "Verona"]:
            streams.append(get_stream(stream_name, self.user_profile.realm))
        do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False)
        prereg_users = PreregistrationUser.objects.filter(referred_by__realm=self.user_profile.realm)
        events = self.do_test(
            lambda: do_revoke_user_invite(prereg_users[0]),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_invitation_accept_invite_event(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('invites_changed')),
        ])

        self.user_profile = self.example_user('iago')
        streams = []
        for stream_name in ["Denmark", "Scotland"]:
            streams.append(get_stream(stream_name, self.user_profile.realm))

        do_invite_users(self.user_profile, ["foo@zulip.com"], streams, False)
        prereg_users = PreregistrationUser.objects.get(email="foo@zulip.com")

        events = self.do_test(
            lambda: do_create_user('foo@zulip.com', 'password', self.user_profile.realm,
                                   'full name', 'short name', prereg_user=prereg_users),
            state_change_expected=True,
            num_events=5,
        )

        error = schema_checker('events[4]', events[4])
        self.assert_on_error(error)

    def test_typing_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('typing')),
            ('op', equals('start')),
            ('sender', check_dict_only([
                ('email', check_string),
                ('user_id', check_int)])),
            ('recipients', check_list(check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
            ]))),
        ])

        events = self.do_test(
            lambda: check_send_typing_notification(
                self.user_profile, [self.example_email("cordelia")], "start"),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_get_typing_user_profiles(self) -> None:
        """
        Make sure we properly assert failures for recipient types that should not
        get typing... notifications.
        """

        sender_profile = self.example_user('cordelia')
        stream = get_stream('Rome', sender_profile.realm)

        # Test stream
        with self.assertRaisesRegex(ValueError, 'not supported for streams'):
            recipient = Recipient.objects.get(type_id=stream.id, type=Recipient.STREAM)
            get_typing_user_profiles(recipient, sender_profile.id)

        # Test some other recipient type
        with self.assertRaisesRegex(ValueError, 'Bad recipient type'):
            recipient = Recipient(type=999)  # invalid type
            get_typing_user_profiles(recipient, sender_profile.id)

    def test_custom_profile_fields_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('custom_profile_fields')),
            ('op', equals('add')),
            ('fields', check_list(check_dict_only([
                ('id', check_int),
                ('type', check_int),
                ('name', check_string),
                ('hint', check_string),
                ('field_data', check_string),
                ('order', check_int),
            ]))),
        ])

        events = self.do_test(
            lambda: notify_realm_custom_profile_fields(
                self.user_profile.realm, 'add'),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        realm = self.user_profile.realm
        field = realm.customprofilefield_set.get(realm=realm, name='Biography')
        name = field.name
        hint = 'Biography of the user'
        try_update_realm_custom_profile_field(realm, field, name, hint=hint)

        events = self.do_test(
            lambda: notify_realm_custom_profile_fields(
                self.user_profile.realm, 'add'),
            state_change_expected=False,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_custom_profile_field_data_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('update')),
            ('person', check_dict_only([
                ('user_id', check_int),
                ('custom_profile_field', check_dict_only([
                    ('id', check_int),
                    ('value', check_none_or(check_string)),
                ])),
            ])),
        ])

        realm = get_realm("zulip")
        field_id = realm.customprofilefield_set.get(realm=realm, name='Biography').id
        field = {
            "id": field_id,
            "value": "New value",
        }
        events = self.do_test(lambda: do_update_user_custom_profile_data(self.user_profile, [field]))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_presence_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('presence')),
            ('email', check_string),
            ('server_timestamp', check_float),
            ('presence', check_dict_only([
                ('website', check_dict_only([
                    ('status', equals('active')),
                    ('timestamp', check_int),
                    ('client', check_string),
                    ('pushable', check_bool),
                ])),
            ])),
        ])
        events = self.do_test(lambda: do_update_user_presence(
            self.user_profile, get_client("website"), timezone_now(), UserPresence.ACTIVE))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_presence_events_multiple_clients(self) -> None:
        schema_checker_android = self.check_events_dict([
            ('type', equals('presence')),
            ('email', check_string),
            ('server_timestamp', check_float),
            ('presence', check_dict_only([
                ('ZulipAndroid/1.0', check_dict_only([
                    ('status', equals('idle')),
                    ('timestamp', check_int),
                    ('client', check_string),
                    ('pushable', check_bool),
                ])),
            ])),
        ])
        self.api_post(self.user_profile.email, "/api/v1/users/me/presence", {'status': 'idle'},
                      HTTP_USER_AGENT="ZulipAndroid/1.0")
        self.do_test(lambda: do_update_user_presence(
            self.user_profile, get_client("website"), timezone_now(), UserPresence.ACTIVE))
        events = self.do_test(lambda: do_update_user_presence(
            self.user_profile, get_client("ZulipAndroid/1.0"), timezone_now(), UserPresence.IDLE))
        error = schema_checker_android('events[0]', events[0])
        self.assert_on_error(error)

    def test_pointer_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('pointer')),
            ('pointer', check_int)
        ])
        events = self.do_test(lambda: do_update_pointer(self.user_profile, get_client("website"), 1500))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_register_events(self) -> None:
        realm_user_add_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('add')),
            ('person', check_dict_only([
                ('user_id', check_int),
                ('email', check_string),
                ('avatar_url', check_none_or(check_string)),
                ('full_name', check_string),
                ('is_admin', check_bool),
                ('is_bot', check_bool),
                ('profile_data', check_dict_only([])),
                ('timezone', check_string),
                ('date_joined', check_string),
            ])),
        ])

        events = self.do_test(lambda: self.register("test1@zulip.com", "test1"))
        self.assert_length(events, 1)
        error = realm_user_add_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_alert_words_events(self) -> None:
        alert_words_checker = self.check_events_dict([
            ('type', equals('alert_words')),
            ('alert_words', check_list(check_string)),
        ])

        events = self.do_test(lambda: do_add_alert_words(self.user_profile, ["alert_word"]))
        error = alert_words_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_remove_alert_words(self.user_profile, ["alert_word"]))
        error = alert_words_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_user_group_events(self) -> None:
        user_group_add_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('add')),
            ('group', check_dict_only([
                ('id', check_int),
                ('name', check_string),
                ('members', check_list(check_int)),
                ('description', check_string),
            ])),
        ])
        othello = self.example_user('othello')
        zulip = get_realm('zulip')
        events = self.do_test(lambda: check_add_user_group(zulip, 'backend', [othello],
                                                           'Backend team'))
        error = user_group_add_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Test name update
        user_group_update_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('update')),
            ('group_id', check_int),
            ('data', check_dict_only([
                ('name', check_string),
            ])),
        ])
        backend = UserGroup.objects.get(name='backend')
        events = self.do_test(lambda: do_update_user_group_name(backend, 'backendteam'))
        error = user_group_update_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Test description update
        user_group_update_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('update')),
            ('group_id', check_int),
            ('data', check_dict_only([
                ('description', check_string),
            ])),
        ])
        description = "Backend team to deal with backend code."
        events = self.do_test(lambda: do_update_user_group_description(backend, description))
        error = user_group_update_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Test add members
        user_group_add_member_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('add_members')),
            ('group_id', check_int),
            ('user_ids', check_list(check_int)),
        ])
        hamlet = self.example_user('hamlet')
        events = self.do_test(lambda: bulk_add_members_to_user_group(backend, [hamlet]))
        error = user_group_add_member_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Test remove members
        user_group_remove_member_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('remove_members')),
            ('group_id', check_int),
            ('user_ids', check_list(check_int)),
        ])
        hamlet = self.example_user('hamlet')
        events = self.do_test(lambda: remove_members_from_user_group(backend, [hamlet]))
        error = user_group_remove_member_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Test delete event
        user_group_remove_checker = self.check_events_dict([
            ('type', equals('user_group')),
            ('op', equals('remove')),
            ('group_id', check_int),
        ])
        events = self.do_test(lambda: check_delete_user_group(backend.id, othello))
        error = user_group_remove_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_default_stream_groups_events(self) -> None:
        default_stream_groups_checker = self.check_events_dict([
            ('type', equals('default_stream_groups')),
            ('default_stream_groups', check_list(check_dict_only([
                ('name', check_string),
                ('id', check_int),
                ('description', check_string),
                ('streams', check_list(check_dict_only([
                    ('description', check_string),
                    ('invite_only', check_bool),
                    ('is_announcement_only', check_bool),
                    ('name', check_string),
                    ('stream_id', check_int),
                    ('history_public_to_subscribers', check_bool)]))),
            ]))),
        ])

        streams = []
        for stream_name in ["Scotland", "Verona", "Denmark"]:
            streams.append(get_stream(stream_name, self.user_profile.realm))

        events = self.do_test(lambda: do_create_default_stream_group(
            self.user_profile.realm, "group1", "This is group1", streams))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

        group = lookup_default_stream_groups(["group1"], self.user_profile.realm)[0]
        venice_stream = get_stream("Venice", self.user_profile.realm)
        events = self.do_test(lambda: do_add_streams_to_default_stream_group(self.user_profile.realm,
                                                                             group, [venice_stream]))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_remove_streams_from_default_stream_group(self.user_profile.realm,
                                                                                  group, [venice_stream]))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_change_default_stream_group_description(self.user_profile.realm,
                                                                                 group, "New description"))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_change_default_stream_group_name(self.user_profile.realm,
                                                                          group, "New Group Name"))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_remove_default_stream_group(self.user_profile.realm, group))
        error = default_stream_groups_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_default_streams_events(self) -> None:
        default_streams_checker = self.check_events_dict([
            ('type', equals('default_streams')),
            ('default_streams', check_list(check_dict_only([
                ('description', check_string),
                ('invite_only', check_bool),
                ('name', check_string),
                ('stream_id', check_int),
            ]))),
        ])

        stream = get_stream("Scotland", self.user_profile.realm)
        events = self.do_test(lambda: do_add_default_stream(stream))
        error = default_streams_checker('events[0]', events[0])
        events = self.do_test(lambda: do_remove_default_stream(stream))
        error = default_streams_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_muted_topics_events(self) -> None:
        muted_topics_checker = self.check_events_dict([
            ('type', equals('muted_topics')),
            ('muted_topics', check_list(check_list(check_string, 2))),
        ])
        stream = get_stream('Denmark', self.user_profile.realm)
        recipient = get_stream_recipient(stream.id)
        events = self.do_test(lambda: do_mute_topic(
            self.user_profile, stream, recipient, "topic"))
        error = muted_topics_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_unmute_topic(
            self.user_profile, stream, "topic"))
        error = muted_topics_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_avatar_fields(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('update')),
            ('person', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('avatar_url', check_string),
                ('avatar_url_medium', check_string),
                ('avatar_source', check_string),
            ])),
        ])
        events = self.do_test(
            lambda: do_change_avatar_fields(self.user_profile, UserProfile.AVATAR_FROM_USER),
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        schema_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('update')),
            ('person', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('avatar_url', check_none_or(check_string)),
                ('avatar_url_medium', check_none_or(check_string)),
                ('avatar_source', check_string),
            ])),
        ])
        events = self.do_test(
            lambda: do_change_avatar_fields(self.user_profile, UserProfile.AVATAR_FROM_GRAVATAR),
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_full_name(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('update')),
            ('person', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int),
            ])),
        ])
        events = self.do_test(lambda: do_change_full_name(self.user_profile, 'Sir Hamlet', self.user_profile))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def do_set_realm_property_test(self, name: str) -> None:
        bool_tests = [True, False, True]  # type: List[bool]
        test_values = dict(
            default_language=[u'es', u'de', u'en'],
            description=[u'Realm description', u'New description'],
            message_retention_days=[10, 20],
            name=[u'Zulip', u'New Name'],
            waiting_period_threshold=[10, 20],
            bot_creation_policy=[Realm.BOT_CREATION_EVERYONE],
            video_chat_provider=[u'Google Hangouts', u'Jitsi'],
            google_hangouts_domain=[u"zulip.com", u"zulip.org"],
        )  # type: Dict[str, Any]

        vals = test_values.get(name)
        property_type = Realm.property_types[name]
        if property_type is bool:
            validator = check_bool
            vals = bool_tests
        elif property_type is str:
            validator = check_string
        elif property_type is int:
            validator = check_int
        elif property_type == (int, type(None)):
            validator = check_int
        else:
            raise AssertionError("Unexpected property type %s" % (property_type,))
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update')),
            ('property', equals(name)),
            ('value', validator),
        ])

        if vals is None:
            raise AssertionError('No test created for %s' % (name))
        do_set_realm_property(self.user_profile.realm, name, vals[0])
        for val in vals[1:]:
            events = self.do_test(
                lambda: do_set_realm_property(self.user_profile.realm, name, val))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    @slow("Actually runs several full-stack fetching tests")
    def test_change_realm_property(self) -> None:
        for prop in Realm.property_types:
            self.do_set_realm_property_test(prop)

    @slow("Runs a large matrix of tests")
    def test_change_realm_authentication_methods(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update_dict')),
            ('property', equals('default')),
            ('data', check_dict_only([
                ('authentication_methods', check_dict([]))
            ])),
        ])

        def fake_backends() -> Any:
            backends = (
                'zproject.backends.DevAuthBackend',
                'zproject.backends.EmailAuthBackend',
                'zproject.backends.GitHubAuthBackend',
                'zproject.backends.GoogleMobileOauth2Backend',
                'zproject.backends.ZulipLDAPAuthBackend',
            )
            return self.settings(AUTHENTICATION_BACKENDS=backends)

        # Test transitions; any new backends should be tested with T/T/T/F/T
        for (auth_method_dict) in \
                ({'Google': True, 'Email': True, 'GitHub': True, 'LDAP': False, 'Dev': False},
                 {'Google': True, 'Email': True, 'GitHub': False, 'LDAP': False, 'Dev': False},
                 {'Google': True, 'Email': False, 'GitHub': False, 'LDAP': False, 'Dev': False},
                 {'Google': True, 'Email': False, 'GitHub': True, 'LDAP': False, 'Dev': False},
                 {'Google': False, 'Email': False, 'GitHub': False, 'LDAP': False, 'Dev': True},
                 {'Google': False, 'Email': False, 'GitHub': True, 'LDAP': False, 'Dev': True},
                 {'Google': False, 'Email': True, 'GitHub': True, 'LDAP': True, 'Dev': False}):
            with fake_backends():
                events = self.do_test(
                    lambda: do_set_realm_authentication_methods(
                        self.user_profile.realm,
                        auth_method_dict))

            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    def test_change_pin_stream(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('update')),
            ('property', equals('pin_to_top')),
            ('stream_id', check_int),
            ('value', check_bool),
            ('name', check_string),
            ('email', check_string),
        ])
        stream = get_stream("Denmark", self.user_profile.realm)
        sub = get_subscription(stream.name, self.user_profile)
        do_change_subscription_property(self.user_profile, sub, stream, "pin_to_top", False)
        for pinned in (True, False):
            events = self.do_test(lambda: do_change_subscription_property(self.user_profile, sub, stream, "pin_to_top", pinned))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    @slow("Runs a matrix of 6 queries to the /home view")
    def test_change_realm_message_edit_settings(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update_dict')),
            ('property', equals('default')),
            ('data', check_dict_only([
                ('allow_message_editing', check_bool),
                ('message_content_edit_limit_seconds', check_int),
                ('allow_community_topic_editing', check_bool),
            ])),
        ])
        # Test every transition among the four possibilities {T,F} x {0, non-0}
        for (allow_message_editing, message_content_edit_limit_seconds) in \
            ((True, 0), (False, 0), (False, 1234),
             (True, 600), (False, 0), (True, 1234)):
            events = self.do_test(
                lambda: do_set_realm_message_editing(self.user_profile.realm,
                                                     allow_message_editing,
                                                     message_content_edit_limit_seconds,
                                                     False))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    def test_change_realm_notifications_stream(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update')),
            ('property', equals('notifications_stream_id')),
            ('value', check_int),
        ])

        stream = get_stream("Rome", self.user_profile.realm)

        for notifications_stream, notifications_stream_id in ((stream, stream.id), (None, -1)):
            events = self.do_test(
                lambda: do_set_realm_notifications_stream(self.user_profile.realm,
                                                          notifications_stream,
                                                          notifications_stream_id))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    def test_change_realm_signup_notifications_stream(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update')),
            ('property', equals('signup_notifications_stream_id')),
            ('value', check_int),
        ])

        stream = get_stream("Rome", self.user_profile.realm)

        for signup_notifications_stream, signup_notifications_stream_id in ((stream, stream.id), (None, -1)):
            events = self.do_test(
                lambda: do_set_realm_signup_notifications_stream(self.user_profile.realm,
                                                                 signup_notifications_stream,
                                                                 signup_notifications_stream_id))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    def test_change_is_admin(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_user')),
            ('op', equals('update')),
            ('person', check_dict_only([
                ('email', check_string),
                ('is_admin', check_bool),
                ('user_id', check_int),
            ])),
        ])
        do_change_is_admin(self.user_profile, False)
        for is_admin in [True, False]:
            events = self.do_test(lambda: do_change_is_admin(self.user_profile, is_admin))
            error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

    def do_set_user_display_settings_test(self, setting_name: str) -> None:
        """Test updating each setting in UserProfile.property_types dict."""

        test_changes = dict(
            emojiset = [u'apple', u'twitter'],
            default_language = [u'es', u'de', u'en'],
            timezone = [u'US/Mountain', u'US/Samoa', u'Pacific/Galapogos', u'']
        )  # type: Dict[str, Any]

        property_type = UserProfile.property_types[setting_name]
        if property_type is bool:
            validator = check_bool
        elif property_type is str:
            validator = check_string
        else:
            raise AssertionError("Unexpected property type %s" % (property_type,))

        num_events = 1
        if setting_name == "timezone":
            num_events = 2
        values = test_changes.get(setting_name)
        if property_type is bool:
            if getattr(self.user_profile, setting_name) is False:
                values = [True, False, True]
            else:
                values = [False, True, False]
        if values is None:
            raise AssertionError('No test created for %s' % (setting_name))

        for value in values:
            events = self.do_test(lambda: do_set_user_display_setting(
                self.user_profile, setting_name, value), num_events=num_events)

            schema_checker = self.check_events_dict([
                ('type', equals('update_display_settings')),
                ('setting_name', equals(setting_name)),
                ('user', check_string),
                ('setting', validator),
            ])
            language_schema_checker = self.check_events_dict([
                ('type', equals('update_display_settings')),
                ('language_name', check_string),
                ('setting_name', equals(setting_name)),
                ('user', check_string),
                ('setting', validator),
            ])
            if setting_name == "default_language":
                error = language_schema_checker('events[0]', events[0])
            else:
                error = schema_checker('events[0]', events[0])
            self.assert_on_error(error)

            timezone_schema_checker = self.check_events_dict([
                ('type', equals('realm_user')),
                ('op', equals('update')),
                ('person', check_dict_only([
                    ('email', check_string),
                    ('user_id', check_int),
                    ('timezone', check_string),
                ])),
            ])
            if setting_name == "timezone":
                error = timezone_schema_checker('events[1]', events[1])

    @slow("Actually runs several full-stack fetching tests")
    def test_set_user_display_settings(self) -> None:
        for prop in UserProfile.property_types:
            self.do_set_user_display_settings_test(prop)

    @slow("Actually runs several full-stack fetching tests")
    def test_change_notification_settings(self) -> None:
        for notification_setting, v in self.user_profile.notification_setting_types.items():
            schema_checker = self.check_events_dict([
                ('type', equals('update_global_notifications')),
                ('notification_name', equals(notification_setting)),
                ('user', check_string),
                ('setting', check_bool),
            ])
            do_change_notification_settings(self.user_profile, notification_setting, False)
            for setting_value in [True, False]:
                events = self.do_test(lambda: do_change_notification_settings(
                    self.user_profile, notification_setting, setting_value, log=False))
                error = schema_checker('events[0]', events[0])
                self.assert_on_error(error)

    def test_realm_emoji_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_emoji')),
            ('op', equals('update')),
            ('realm_emoji', check_dict([])),
        ])
        author = self.example_user('iago')
        with get_test_image_file('img.png') as img_file:
            events = self.do_test(lambda: check_add_realm_emoji(get_realm("zulip"),
                                                                "my_emoji",
                                                                author,
                                                                img_file))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        events = self.do_test(lambda: do_remove_realm_emoji(get_realm("zulip"), "my_emoji"))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_realm_filter_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_filters')),
            ('realm_filters', check_list(None)),  # TODO: validate tuples in the list
        ])
        events = self.do_test(lambda: do_add_realm_filter(get_realm("zulip"), "#(?P<id>[123])",
                                                          "https://realm.com/my_realm_filter/%(id)s"))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        self.do_test(lambda: do_remove_realm_filter(get_realm("zulip"), "#(?P<id>[123])"))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_realm_domain_events(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('realm_domains')),
            ('op', equals('add')),
            ('realm_domain', check_dict_only([
                ('domain', check_string),
                ('allow_subdomains', check_bool),
            ])),
        ])
        realm = get_realm('zulip')
        events = self.do_test(lambda: do_add_realm_domain(realm, 'zulip.org', False))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        schema_checker = self.check_events_dict([
            ('type', equals('realm_domains')),
            ('op', equals('change')),
            ('realm_domain', check_dict_only([
                ('domain', equals('zulip.org')),
                ('allow_subdomains', equals(True)),
            ])),
        ])
        test_domain = RealmDomain.objects.get(realm=realm, domain='zulip.org')
        events = self.do_test(lambda: do_change_realm_domain(test_domain, True))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        schema_checker = self.check_events_dict([
            ('type', equals('realm_domains')),
            ('op', equals('remove')),
            ('domain', equals('zulip.org')),
        ])
        events = self.do_test(lambda: do_remove_realm_domain(test_domain))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_create_bot(self) -> None:

        def get_bot_created_checker(bot_type: str) -> Validator:
            if bot_type == "GENERIC_BOT":
                check_services = check_list(sub_validator=None, length=0)
            elif bot_type == "OUTGOING_WEBHOOK_BOT":
                check_services = check_list(check_dict_only([
                    ('base_url', check_url),
                    ('interface', check_int),
                    ('token', check_string),
                ]), length=1)
            elif bot_type == "EMBEDDED_BOT":
                check_services = check_list(check_dict_only([
                    ('service_name', check_string),
                    ('config_data', check_dict(value_validator=check_string)),
                ]), length=1)
            return self.check_events_dict([
                ('type', equals('realm_bot')),
                ('op', equals('add')),
                ('bot', check_dict_only([
                    ('email', check_string),
                    ('user_id', check_int),
                    ('bot_type', check_int),
                    ('full_name', check_string),
                    ('is_active', check_bool),
                    ('api_key', check_string),
                    ('default_sending_stream', check_none_or(check_string)),
                    ('default_events_register_stream', check_none_or(check_string)),
                    ('default_all_public_streams', check_bool),
                    ('avatar_url', check_string),
                    ('owner', check_string),
                    ('services', check_services),
                ])),
            ])
        action = lambda: self.create_bot('test')
        events = self.do_test(action, num_events=3)
        error = get_bot_created_checker(bot_type="GENERIC_BOT")('events[1]', events[1])
        self.assert_on_error(error)

        action = lambda: self.create_bot('test_outgoing_webhook',
                                         payload_url=ujson.dumps('https://foo.bar.com'),
                                         interface_type=Service.GENERIC,
                                         bot_type=UserProfile.OUTGOING_WEBHOOK_BOT)
        events = self.do_test(action, num_events=3)
        # The third event is the second call of notify_created_bot, which contains additional
        # data for services (in contrast to the first call).
        error = get_bot_created_checker(bot_type="OUTGOING_WEBHOOK_BOT")('events[2]', events[2])
        self.assert_on_error(error)

        action = lambda: self.create_bot('test_embedded',
                                         service_name='helloworld',
                                         config_data=ujson.dumps({'foo': 'bar'}),
                                         bot_type=UserProfile.EMBEDDED_BOT)
        events = self.do_test(action, num_events=3)
        error = get_bot_created_checker(bot_type="EMBEDDED_BOT")('events[2]', events[2])
        self.assert_on_error(error)

    def test_change_bot_full_name(self) -> None:
        bot = self.create_bot('test')
        action = lambda: do_change_full_name(bot, 'New Bot Name', self.user_profile)
        events = self.do_test(action, num_events=2)
        error = self.realm_bot_schema('full_name', check_string)('events[1]', events[1])
        self.assert_on_error(error)

    def test_regenerate_bot_api_key(self) -> None:
        bot = self.create_bot('test')
        action = lambda: do_regenerate_api_key(bot, self.user_profile)
        events = self.do_test(action)
        error = self.realm_bot_schema('api_key', check_string)('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_bot_avatar_source(self) -> None:
        bot = self.create_bot('test')
        action = lambda: do_change_avatar_fields(bot, bot.AVATAR_FROM_USER)
        events = self.do_test(action, num_events=2)
        error = self.realm_bot_schema('avatar_url', check_string)('events[0]', events[0])
        self.assertEqual(events[1]['type'], 'realm_user')
        self.assert_on_error(error)

    def test_change_realm_icon_source(self) -> None:
        realm = get_realm('zulip')
        action = lambda: do_change_icon_source(realm, realm.ICON_FROM_GRAVATAR)
        events = self.do_test(action, state_change_expected=False)
        schema_checker = self.check_events_dict([
            ('type', equals('realm')),
            ('op', equals('update_dict')),
            ('property', equals('icon')),
            ('data', check_dict_only([
                ('icon_url', check_string),
                ('icon_source', check_string),
            ])),
        ])
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_bot_default_all_public_streams(self) -> None:
        bot = self.create_bot('test')
        action = lambda: do_change_default_all_public_streams(bot, True)
        events = self.do_test(action)
        error = self.realm_bot_schema('default_all_public_streams', check_bool)('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_bot_default_sending_stream(self) -> None:
        bot = self.create_bot('test')
        stream = get_stream("Rome", bot.realm)

        action = lambda: do_change_default_sending_stream(bot, stream)
        events = self.do_test(action)
        error = self.realm_bot_schema('default_sending_stream', check_string)('events[0]', events[0])
        self.assert_on_error(error)

        action = lambda: do_change_default_sending_stream(bot, None)
        events = self.do_test(action)
        error = self.realm_bot_schema('default_sending_stream', equals(None))('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_bot_default_events_register_stream(self) -> None:
        bot = self.create_bot('test')
        stream = get_stream("Rome", bot.realm)

        action = lambda: do_change_default_events_register_stream(bot, stream)
        events = self.do_test(action)
        error = self.realm_bot_schema('default_events_register_stream', check_string)('events[0]', events[0])
        self.assert_on_error(error)

        action = lambda: do_change_default_events_register_stream(bot, None)
        events = self.do_test(action)
        error = self.realm_bot_schema('default_events_register_stream', equals(None))('events[0]', events[0])
        self.assert_on_error(error)

    def test_change_bot_owner(self) -> None:
        change_bot_owner_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('update')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('owner_id', check_int),
            ])),
        ])
        self.user_profile = self.example_user('iago')
        owner = self.example_user('hamlet')
        bot = self.create_bot('test')
        action = lambda: do_change_bot_owner(bot, owner, self.user_profile)
        events = self.do_test(action)
        error = change_bot_owner_checker('events[0]', events[0])
        self.assert_on_error(error)

        change_bot_owner_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('delete')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
            ])),
        ])
        self.user_profile = self.example_user('aaron')
        owner = self.example_user('hamlet')
        bot = self.create_bot('test1')
        action = lambda: do_change_bot_owner(bot, owner, self.user_profile)
        events = self.do_test(action)
        error = change_bot_owner_checker('events[0]', events[0])
        self.assert_on_error(error)

        check_services = check_list(sub_validator=None, length=0)
        change_bot_owner_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('add')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('bot_type', check_int),
                ('full_name', check_string),
                ('is_active', check_bool),
                ('api_key', check_string),
                ('default_sending_stream', check_none_or(check_string)),
                ('default_events_register_stream', check_none_or(check_string)),
                ('default_all_public_streams', check_bool),
                ('avatar_url', check_string),
                ('owner', check_string),
                ('services', check_services),
            ])),
        ])
        previous_owner = self.example_user('aaron')
        self.user_profile = self.example_user('hamlet')
        bot = self.create_test_bot('test2', previous_owner)
        action = lambda: do_change_bot_owner(bot, self.user_profile, previous_owner)
        events = self.do_test(action)
        error = change_bot_owner_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_do_update_outgoing_webhook_service(self):
        # type: () -> None
        update_outgoing_webhook_service_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('update')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('services', check_list(check_dict_only([
                    ('base_url', check_url),
                    ('interface', check_int),
                    ('token', check_string),
                ]))),
            ])),
        ])
        self.user_profile = self.example_user('iago')
        bot = self.create_test_bot('test', self.user_profile,
                                   full_name='Test Bot',
                                   bot_type=UserProfile.OUTGOING_WEBHOOK_BOT,
                                   payload_url=ujson.dumps('http://hostname.domain2.com'),
                                   interface_type=Service.GENERIC,
                                   )
        action = lambda: do_update_outgoing_webhook_service(bot, 2, 'http://hostname.domain2.com')
        events = self.do_test(action)
        error = update_outgoing_webhook_service_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_do_deactivate_user(self) -> None:
        bot_deactivate_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('remove')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('full_name', check_string),
                ('user_id', check_int),
            ])),
        ])
        bot = self.create_bot('test')
        action = lambda: do_deactivate_user(bot)
        events = self.do_test(action, num_events=2)
        error = bot_deactivate_checker('events[1]', events[1])
        self.assert_on_error(error)

    def test_do_reactivate_user(self) -> None:
        bot_reactivate_checker = self.check_events_dict([
            ('type', equals('realm_bot')),
            ('op', equals('add')),
            ('bot', check_dict_only([
                ('email', check_string),
                ('user_id', check_int),
                ('bot_type', check_int),
                ('full_name', check_string),
                ('is_active', check_bool),
                ('api_key', check_string),
                ('default_sending_stream', check_none_or(check_string)),
                ('default_events_register_stream', check_none_or(check_string)),
                ('default_all_public_streams', check_bool),
                ('avatar_url', check_string),
                ('owner', check_none_or(check_string)),
                ('services', check_list(check_dict_only([
                    ('base_url', check_url),
                    ('interface', check_int),
                ]))),
            ])),
        ])
        bot = self.create_bot('test')
        do_deactivate_user(bot)
        action = lambda: do_reactivate_user(bot)
        events = self.do_test(action, num_events=2)
        error = bot_reactivate_checker('events[1]', events[1])
        self.assert_on_error(error)

    def test_do_mark_hotspot_as_read(self) -> None:
        self.user_profile.tutorial_status = UserProfile.TUTORIAL_WAITING
        self.user_profile.save(update_fields=['tutorial_status'])

        schema_checker = self.check_events_dict([
            ('type', equals('hotspots')),
            ('hotspots', check_list(check_dict_only([
                ('name', check_string),
                ('title', check_string),
                ('description', check_string),
                ('delay', check_float),
            ]))),
        ])
        events = self.do_test(lambda: do_mark_hotspot_as_read(self.user_profile, 'intro_reply'))
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_rename_stream(self) -> None:
        stream = self.make_stream('old_name')
        new_name = u'stream with a brand new name'
        self.subscribe(self.user_profile, stream.name)

        action = lambda: do_rename_stream(stream, new_name)
        events = self.do_test(action, num_events=2)

        schema_checker = self.check_events_dict([
            ('type', equals('stream')),
            ('op', equals('update')),
            ('property', equals('email_address')),
            ('value', check_string),
            ('stream_id', check_int),
            ('name', equals('old_name')),
        ])
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)
        schema_checker = self.check_events_dict([
            ('type', equals('stream')),
            ('op', equals('update')),
            ('property', equals('name')),
            ('value', equals(new_name)),
            ('name', equals('old_name')),
            ('stream_id', check_int),
        ])
        error = schema_checker('events[1]', events[1])
        self.assert_on_error(error)

    def test_deactivate_stream_neversubscribed(self) -> None:
        stream = self.make_stream('old_name')

        action = lambda: do_deactivate_stream(stream)
        events = self.do_test(action)

        schema_checker = self.check_events_dict([
            ('type', equals('stream')),
            ('op', equals('delete')),
            ('streams', check_list(check_dict([]))),
        ])
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_subscribe_other_user_never_subscribed(self) -> None:
        action = lambda: self.subscribe(self.example_user("othello"), u"test_stream")
        events = self.do_test(action, num_events=2)
        peer_add_schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('peer_add')),
            ('user_id', check_int),
            ('subscriptions', check_list(check_string)),
        ])
        error = peer_add_schema_checker('events[1]', events[1])
        self.assert_on_error(error)

    @slow("Actually several tests combined together")
    def test_subscribe_events(self) -> None:
        self.do_test_subscribe_events(include_subscribers=True)

    @slow("Actually several tests combined together")
    def test_subscribe_events_no_include_subscribers(self) -> None:
        self.do_test_subscribe_events(include_subscribers=False)

    def do_test_subscribe_events(self, include_subscribers: bool) -> None:
        subscription_fields = [
            ('color', check_string),
            ('description', check_string),
            ('email_address', check_string),
            ('invite_only', check_bool),
            ('is_announcement_only', check_bool),
            ('in_home_view', check_bool),
            ('name', check_string),
            ('audible_notifications', check_bool),
            ('email_notifications', check_bool),
            ('desktop_notifications', check_bool),
            ('push_notifications', check_bool),
            ('stream_id', check_int),
            ('history_public_to_subscribers', check_bool),
            ('pin_to_top', check_bool),
            ('stream_weekly_traffic', check_none_or(check_int)),
            ('is_old_stream', check_bool),
        ]
        if include_subscribers:
            subscription_fields.append(('subscribers', check_list(check_int)))  # type: ignore
        subscription_schema_checker = check_list(
            check_dict_only(subscription_fields),
        )
        stream_create_schema_checker = self.check_events_dict([
            ('type', equals('stream')),
            ('op', equals('create')),
            ('streams', check_list(check_dict_only([
                ('name', check_string),
                ('stream_id', check_int),
                ('invite_only', check_bool),
                ('description', check_string),
            ]))),
        ])
        add_schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('add')),
            ('subscriptions', subscription_schema_checker),
        ])
        remove_schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('remove')),
            ('subscriptions', check_list(
                check_dict_only([
                    ('name', equals('test_stream')),
                    ('stream_id', check_int),
                ]),
            )),
        ])
        peer_add_schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('peer_add')),
            ('user_id', check_int),
            ('subscriptions', check_list(check_string)),
        ])
        peer_remove_schema_checker = self.check_events_dict([
            ('type', equals('subscription')),
            ('op', equals('peer_remove')),
            ('user_id', check_int),
            ('subscriptions', check_list(check_string)),
        ])
        stream_update_schema_checker = self.check_events_dict([
            ('type', equals('stream')),
            ('op', equals('update')),
            ('property', equals('description')),
            ('value', check_string),
            ('stream_id', check_int),
            ('name', check_string),
        ])

        # Subscribe to a totally new stream, so it's just Hamlet on it
        action = lambda: self.subscribe(self.example_user("hamlet"), "test_stream")  # type: Callable[[], Any]
        events = self.do_test(action, event_types=["subscription", "realm_user"],
                              include_subscribers=include_subscribers)
        error = add_schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Add another user to that totally new stream
        action = lambda: self.subscribe(self.example_user("othello"), "test_stream")
        events = self.do_test(action,
                              include_subscribers=include_subscribers,
                              state_change_expected=include_subscribers,
                              )
        error = peer_add_schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        stream = get_stream("test_stream", self.user_profile.realm)

        # Now remove the first user, to test the normal unsubscribe flow
        action = lambda: bulk_remove_subscriptions(
            [self.example_user('othello')],
            [stream],
            get_client("website"))
        events = self.do_test(action,
                              include_subscribers=include_subscribers,
                              state_change_expected=include_subscribers,
                              )
        error = peer_remove_schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Now remove the second user, to test the 'vacate' event flow
        action = lambda: bulk_remove_subscriptions(
            [self.example_user('hamlet')],
            [stream],
            get_client("website"))
        events = self.do_test(action,
                              include_subscribers=include_subscribers,
                              num_events=3)
        error = remove_schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Now resubscribe a user, to make sure that works on a vacated stream
        action = lambda: self.subscribe(self.example_user("hamlet"), "test_stream")
        events = self.do_test(action,
                              include_subscribers=include_subscribers,
                              num_events=2)
        error = add_schema_checker('events[1]', events[1])
        self.assert_on_error(error)

        action = lambda: do_change_stream_description(stream, u'new description')
        events = self.do_test(action,
                              include_subscribers=include_subscribers)
        error = stream_update_schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Subscribe to a totally new invite-only stream, so it's just Hamlet on it
        stream = self.make_stream("private", get_realm("zulip"), invite_only=True)
        user_profile = self.example_user('hamlet')
        action = lambda: bulk_add_subscriptions([stream], [user_profile])
        events = self.do_test(action, include_subscribers=include_subscribers,
                              num_events=2)
        error = stream_create_schema_checker('events[0]', events[0])
        error = add_schema_checker('events[1]', events[1])
        self.assert_on_error(error)

    def test_do_delete_message_stream(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('delete_message')),
            ('message_id', check_int),
            ('sender', check_string),
            ('message_type', equals("stream")),
            ('stream_id', check_int),
            ('topic', check_string),
        ])
        msg_id = self.send_stream_message("hamlet@zulip.com", "Verona")
        message = Message.objects.get(id=msg_id)
        events = self.do_test(
            lambda: do_delete_message(self.user_profile, message),
            state_change_expected=True,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_do_delete_message_personal(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('delete_message')),
            ('message_id', check_int),
            ('sender', check_string),
            ('message_type', equals("private")),
            ('recipient_user_ids', check_int),
        ])
        msg_id = self.send_personal_message(
            self.example_email("cordelia"),
            self.user_profile.email,
            "hello",
        )
        message = Message.objects.get(id=msg_id)
        events = self.do_test(
            lambda: do_delete_message(self.user_profile, message),
            state_change_expected=True,
        )
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

    def test_do_delete_message_no_max_id(self) -> None:
        user_profile = self.example_user('aaron')
        # Delete all historical messages for this user
        user_profile = self.example_user('hamlet')
        UserMessage.objects.filter(user_profile=user_profile).delete()
        msg_id = self.send_stream_message("hamlet@zulip.com", "Verona")
        message = Message.objects.get(id=msg_id)
        self.do_test(
            lambda: do_delete_message(self.user_profile, message),
            state_change_expected=True,
        )
        result = fetch_initial_state_data(user_profile, None, "", client_gravatar=False)
        self.assertEqual(result['max_message_id'], -1)

    def test_add_attachment(self) -> None:
        schema_checker = self.check_events_dict([
            ('type', equals('attachment')),
            ('op', equals('add')),
            ('attachment', check_dict_only([
                ('id', check_int),
                ('name', check_string),
                ('size', check_int),
                ('path_id', check_string),
                ('create_time', check_float),
                ('messages', check_list(check_dict_only([
                    ('id', check_int),
                    ('name', check_float),
                ]))),
            ])),
        ])

        self.login(self.example_email("hamlet"))
        fp = StringIO("zulip!")
        fp.name = "zulip.txt"
        data = {'uri': None}

        def do_upload() -> None:
            result = self.client_post("/json/user_uploads", {'file': fp})

            self.assert_json_success(result)
            self.assertIn("uri", result.json())
            uri = result.json()["uri"]
            base = '/user_uploads/'
            self.assertEqual(base, uri[:len(base)])
            data['uri'] = uri

        events = self.do_test(
            lambda: do_upload(),
            num_events=1, state_change_expected=False)
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Verify that the DB has the attachment marked as unclaimed
        entry = Attachment.objects.get(file_name='zulip.txt')
        self.assertEqual(entry.is_claimed(), False)

        # Now we send an actual message using this attachment.
        schema_checker = self.check_events_dict([
            ('type', equals('attachment')),
            ('op', equals('update')),
            ('attachment', check_dict_only([
                ('id', check_int),
                ('name', check_string),
                ('size', check_int),
                ('path_id', check_string),
                ('create_time', check_float),
                ('messages', check_list(check_dict_only([
                    ('id', check_int),
                    ('name', check_float),
                ]))),
            ])),
        ])

        self.subscribe(self.example_user("hamlet"), "Denmark")
        body = "First message ...[zulip.txt](http://localhost:9991" + data['uri'] + ")"
        events = self.do_test(
            lambda: self.send_stream_message(self.example_email("hamlet"), "Denmark", body, "test"),
            num_events=2)
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

        # Now remove the attachment
        schema_checker = self.check_events_dict([
            ('type', equals('attachment')),
            ('op', equals('remove')),
            ('attachment', check_dict_only([
                ('id', check_int),
            ])),
        ])

        events = self.do_test(
            lambda: self.client_delete("/json/attachments/%s" % (entry.id,)),
            num_events=1, state_change_expected=False)
        error = schema_checker('events[0]', events[0])
        self.assert_on_error(error)

class FetchInitialStateDataTest(ZulipTestCase):
    # Non-admin users don't have access to all bots
    def test_realm_bots_non_admin(self) -> None:
        user_profile = self.example_user('cordelia')
        self.assertFalse(user_profile.is_realm_admin)
        result = fetch_initial_state_data(user_profile, None, "", client_gravatar=False)
        self.assert_length(result['realm_bots'], 0)

        # additionally the API key for a random bot is not present in the data
        api_key = get_api_key(self.notification_bot())
        self.assertNotIn(api_key, str(result))

    # Admin users have access to all bots in the realm_bots field
    def test_realm_bots_admin(self) -> None:
        user_profile = self.example_user('hamlet')
        do_change_is_admin(user_profile, True)
        self.assertTrue(user_profile.is_realm_admin)
        result = fetch_initial_state_data(user_profile, None, "", client_gravatar=False)
        self.assertTrue(len(result['realm_bots']) > 5)

    def test_max_message_id_with_no_history(self) -> None:
        user_profile = self.example_user('aaron')
        # Delete all historical messages for this user
        UserMessage.objects.filter(user_profile=user_profile).delete()
        result = fetch_initial_state_data(user_profile, None, "", client_gravatar=False)
        self.assertEqual(result['max_message_id'], -1)

class GetUnreadMsgsTest(ZulipTestCase):
    def mute_stream(self, user_profile: UserProfile, stream: Stream) -> None:
        recipient = Recipient.objects.get(type_id=stream.id, type=Recipient.STREAM)
        subscription = Subscription.objects.get(
            user_profile=user_profile,
            recipient=recipient
        )
        subscription.in_home_view = False
        subscription.save()

    def mute_topic(self, user_profile: UserProfile, stream_name: str,
                   topic_name: str) -> None:
        realm = user_profile.realm
        stream = get_stream(stream_name, realm)
        recipient = get_stream_recipient(stream.id)

        add_topic_mute(
            user_profile=user_profile,
            stream_id=stream.id,
            recipient_id=recipient.id,
            topic_name=topic_name,
        )

    def test_raw_unread_stream(self) -> None:
        cordelia = self.example_user('cordelia')
        hamlet = self.example_user('hamlet')
        realm = hamlet.realm

        for stream_name in ['social', 'devel', 'test here']:
            self.subscribe(hamlet, stream_name)
            self.subscribe(cordelia, stream_name)

        all_message_ids = set()  # type: Set[int]
        message_ids = dict()

        tups = [
            ('social', 'lunch'),
            ('test here', 'bla'),
            ('devel', 'python'),
            ('devel', 'ruby'),
        ]

        for stream_name, topic_name in tups:
            message_ids[topic_name] = [
                self.send_stream_message(
                    sender_email=cordelia.email,
                    stream_name=stream_name,
                    topic_name=topic_name,
                ) for i in range(3)
            ]
            all_message_ids |= set(message_ids[topic_name])

        self.assertEqual(len(all_message_ids), 12)  # sanity check on test setup

        self.mute_stream(
            user_profile=hamlet,
            stream=get_stream('test here', realm),
        )

        self.mute_topic(
            user_profile=hamlet,
            stream_name='devel',
            topic_name='ruby',
        )

        raw_unread_data = get_raw_unread_data(
            user_profile=hamlet,
        )

        stream_dict = raw_unread_data['stream_dict']

        self.assertEqual(
            set(stream_dict.keys()),
            all_message_ids,
        )

        self.assertEqual(
            raw_unread_data['unmuted_stream_msgs'],
            set(message_ids['python']) | set(message_ids['lunch']),
        )

        self.assertEqual(
            stream_dict[message_ids['lunch'][0]],
            dict(
                sender_id=cordelia.id,
                stream_id=get_stream('social', realm).id,
                topic='lunch',
            )
        )

    def test_raw_unread_huddle(self) -> None:
        cordelia = self.example_user('cordelia')
        othello = self.example_user('othello')
        hamlet = self.example_user('hamlet')
        prospero = self.example_user('prospero')

        huddle1_message_ids = [
            self.send_huddle_message(
                cordelia.email,
                [hamlet.email, othello.email]
            )
            for i in range(3)
        ]

        huddle2_message_ids = [
            self.send_huddle_message(
                cordelia.email,
                [hamlet.email, prospero.email]
            )
            for i in range(3)
        ]

        raw_unread_data = get_raw_unread_data(
            user_profile=hamlet,
        )

        huddle_dict = raw_unread_data['huddle_dict']

        self.assertEqual(
            set(huddle_dict.keys()),
            set(huddle1_message_ids) | set(huddle2_message_ids)
        )

        huddle_string = ','.join(
            str(uid)
            for uid in sorted([cordelia.id, hamlet.id, othello.id])
        )

        self.assertEqual(
            huddle_dict[huddle1_message_ids[0]],
            dict(user_ids_string=huddle_string),
        )

    def test_raw_unread_personal(self) -> None:
        cordelia = self.example_user('cordelia')
        othello = self.example_user('othello')
        hamlet = self.example_user('hamlet')

        cordelia_pm_message_ids = [
            self.send_personal_message(cordelia.email, hamlet.email)
            for i in range(3)
        ]

        othello_pm_message_ids = [
            self.send_personal_message(othello.email, hamlet.email)
            for i in range(3)
        ]

        raw_unread_data = get_raw_unread_data(
            user_profile=hamlet,
        )

        pm_dict = raw_unread_data['pm_dict']

        self.assertEqual(
            set(pm_dict.keys()),
            set(cordelia_pm_message_ids) | set(othello_pm_message_ids)
        )

        self.assertEqual(
            pm_dict[cordelia_pm_message_ids[0]],
            dict(sender_id=cordelia.id),
        )

    def test_unread_msgs(self) -> None:
        cordelia = self.example_user('cordelia')
        sender_id = cordelia.id
        sender_email = cordelia.email
        user_profile = self.example_user('hamlet')
        othello = self.example_user('othello')

        # our tests rely on order
        assert(sender_email < user_profile.email)
        assert(user_profile.email < othello.email)

        pm1_message_id = self.send_personal_message(sender_email, user_profile.email, "hello1")
        pm2_message_id = self.send_personal_message(sender_email, user_profile.email, "hello2")

        muted_stream = self.subscribe(user_profile, 'Muted Stream')
        self.mute_stream(user_profile, muted_stream)
        self.mute_topic(user_profile, 'Denmark', 'muted-topic')

        stream_message_id = self.send_stream_message(sender_email, "Denmark", "hello")
        muted_stream_message_id = self.send_stream_message(sender_email, "Muted Stream", "hello")
        muted_topic_message_id = self.send_stream_message(
            sender_email,
            "Denmark",
            topic_name="muted-topic",
            content="hello",
        )

        huddle_message_id = self.send_huddle_message(
            sender_email,
            [user_profile.email, othello.email],
            'hello3',
        )

        def get_unread_data() -> UnreadMessagesResult:
            raw_unread_data = get_raw_unread_data(user_profile)
            aggregated_data = aggregate_unread_data(raw_unread_data)
            return aggregated_data

        result = get_unread_data()

        # The count here reflects the count of unread messages that we will
        # report to users in the bankruptcy dialog, and for now it excludes unread messages
        # from muted treams, but it doesn't exclude unread messages from muted topics yet.
        self.assertEqual(result['count'], 4)

        unread_pm = result['pms'][0]
        self.assertEqual(unread_pm['sender_id'], sender_id)
        self.assertEqual(unread_pm['unread_message_ids'], [pm1_message_id, pm2_message_id])
        self.assertTrue('sender_ids' not in unread_pm)

        unread_stream = result['streams'][0]
        self.assertEqual(unread_stream['stream_id'], get_stream('Denmark', user_profile.realm).id)
        self.assertEqual(unread_stream['topic'], 'muted-topic')
        self.assertEqual(unread_stream['unread_message_ids'], [muted_topic_message_id])
        self.assertEqual(unread_stream['sender_ids'], [sender_id])

        unread_stream = result['streams'][1]
        self.assertEqual(unread_stream['stream_id'], get_stream('Denmark', user_profile.realm).id)
        self.assertEqual(unread_stream['topic'], 'test')
        self.assertEqual(unread_stream['unread_message_ids'], [stream_message_id])
        self.assertEqual(unread_stream['sender_ids'], [sender_id])

        unread_stream = result['streams'][2]
        self.assertEqual(unread_stream['stream_id'], get_stream('Muted Stream', user_profile.realm).id)
        self.assertEqual(unread_stream['topic'], 'test')
        self.assertEqual(unread_stream['unread_message_ids'], [muted_stream_message_id])
        self.assertEqual(unread_stream['sender_ids'], [sender_id])

        huddle_string = ','.join(str(uid) for uid in sorted([sender_id, user_profile.id, othello.id]))

        unread_huddle = result['huddles'][0]
        self.assertEqual(unread_huddle['user_ids_string'], huddle_string)
        self.assertEqual(unread_huddle['unread_message_ids'], [huddle_message_id])
        self.assertTrue('sender_ids' not in unread_huddle)

        self.assertEqual(result['mentions'], [])

        um = UserMessage.objects.get(
            user_profile_id=user_profile.id,
            message_id=stream_message_id
        )
        um.flags |= UserMessage.flags.mentioned
        um.save()

        result = get_unread_data()
        self.assertEqual(result['mentions'], [stream_message_id])

class EventQueueTest(TestCase):
    def test_one_event(self) -> None:
        queue = EventQueue("1")
        queue.push({"type": "pointer",
                    "pointer": 1,
                    "timestamp": "1"})
        self.assertFalse(queue.empty())
        self.assertEqual(queue.contents(),
                         [{'id': 0,
                           'type': 'pointer',
                           "pointer": 1,
                           "timestamp": "1"}])

    def test_event_collapsing(self) -> None:
        queue = EventQueue("1")
        for pointer_val in range(1, 10):
            queue.push({"type": "pointer",
                        "pointer": pointer_val,
                        "timestamp": str(pointer_val)})
        self.assertEqual(queue.contents(),
                         [{'id': 8,
                           'type': 'pointer',
                           "pointer": 9,
                           "timestamp": "9"}])

        queue = EventQueue("2")
        for pointer_val in range(1, 10):
            queue.push({"type": "pointer",
                        "pointer": pointer_val,
                        "timestamp": str(pointer_val)})
        queue.push({"type": "unknown"})
        queue.push({"type": "restart", "server_generation": "1"})
        for pointer_val in range(11, 20):
            queue.push({"type": "pointer",
                        "pointer": pointer_val,
                        "timestamp": str(pointer_val)})
        queue.push({"type": "restart", "server_generation": "2"})
        self.assertEqual(queue.contents(),
                         [{"type": "unknown",
                           "id": 9},
                          {'id': 19,
                           'type': 'pointer',
                           "pointer": 19,
                           "timestamp": "19"},
                          {"id": 20,
                           "type": "restart",
                           "server_generation": "2"}])
        for pointer_val in range(21, 23):
            queue.push({"type": "pointer",
                        "pointer": pointer_val,
                        "timestamp": str(pointer_val)})
        self.assertEqual(queue.contents(),
                         [{"type": "unknown",
                           "id": 9},
                          {'id': 19,
                           'type': 'pointer',
                           "pointer": 19,
                           "timestamp": "19"},
                          {"id": 20,
                           "type": "restart",
                           "server_generation": "2"},
                          {'id': 22,
                           'type': 'pointer',
                           "pointer": 22,
                           "timestamp": "22"},
                          ])

    def test_flag_add_collapsing(self) -> None:
        queue = EventQueue("1")
        queue.push({"type": "update_message_flags",
                    "flag": "read",
                    "operation": "add",
                    "all": False,
                    "messages": [1, 2, 3, 4],
                    "timestamp": "1"})
        queue.push({"type": "update_message_flags",
                    "flag": "read",
                    "all": False,
                    "operation": "add",
                    "messages": [5, 6],
                    "timestamp": "1"})
        self.assertEqual(queue.contents(),
                         [{'id': 1,
                           'type': 'update_message_flags',
                           "all": False,
                           "flag": "read",
                           "operation": "add",
                           "messages": [1, 2, 3, 4, 5, 6],
                           "timestamp": "1"}])

    def test_flag_remove_collapsing(self) -> None:
        queue = EventQueue("1")
        queue.push({"type": "update_message_flags",
                    "flag": "collapsed",
                    "operation": "remove",
                    "all": False,
                    "messages": [1, 2, 3, 4],
                    "timestamp": "1"})
        queue.push({"type": "update_message_flags",
                    "flag": "collapsed",
                    "all": False,
                    "operation": "remove",
                    "messages": [5, 6],
                    "timestamp": "1"})
        self.assertEqual(queue.contents(),
                         [{'id': 1,
                           'type': 'update_message_flags',
                           "all": False,
                           "flag": "collapsed",
                           "operation": "remove",
                           "messages": [1, 2, 3, 4, 5, 6],
                           "timestamp": "1"}])

    def test_collapse_event(self) -> None:
        queue = EventQueue("1")
        queue.push({"type": "pointer",
                    "pointer": 1,
                    "timestamp": "1"})
        queue.push({"type": "unknown",
                    "timestamp": "1"})
        self.assertEqual(queue.contents(),
                         [{'id': 0,
                           'type': 'pointer',
                           "pointer": 1,
                           "timestamp": "1"},
                          {'id': 1,
                           'type': 'unknown',
                           "timestamp": "1"}])

class ClientDescriptorsTest(ZulipTestCase):
    def test_get_client_info_for_all_public_streams(self) -> None:
        hamlet = self.example_user('hamlet')
        realm = hamlet.realm

        queue_data = dict(
            all_public_streams=True,
            apply_markdown=True,
            client_gravatar=True,
            client_type_name='website',
            event_types=['message'],
            last_connection_time=time.time(),
            queue_timeout=0,
            realm_id=realm.id,
            user_profile_id=hamlet.id,
        )

        client = allocate_client_descriptor(queue_data)

        message_event = dict(
            realm_id=realm.id,
            stream_name='whatever',
        )

        client_info = get_client_info_for_message_event(
            message_event,
            users=[],
        )

        self.assertEqual(len(client_info), 1)

        dct = client_info[client.event_queue.id]
        self.assertEqual(dct['client'].apply_markdown, True)
        self.assertEqual(dct['client'].client_gravatar, True)
        self.assertEqual(dct['client'].user_profile_id, hamlet.id)
        self.assertEqual(dct['flags'], [])
        self.assertEqual(dct['is_sender'], False)

        message_event = dict(
            realm_id=realm.id,
            stream_name='whatever',
            sender_queue_id=client.event_queue.id,
        )

        client_info = get_client_info_for_message_event(
            message_event,
            users=[],
        )
        dct = client_info[client.event_queue.id]
        self.assertEqual(dct['is_sender'], True)

    def test_get_client_info_for_normal_users(self) -> None:
        hamlet = self.example_user('hamlet')
        cordelia = self.example_user('cordelia')
        realm = hamlet.realm

        def test_get_info(apply_markdown: bool, client_gravatar: bool) -> None:
            clear_client_event_queues_for_testing()

            queue_data = dict(
                all_public_streams=False,
                apply_markdown=apply_markdown,
                client_gravatar=client_gravatar,
                client_type_name='website',
                event_types=['message'],
                last_connection_time=time.time(),
                queue_timeout=0,
                realm_id=realm.id,
                user_profile_id=hamlet.id,
            )

            client = allocate_client_descriptor(queue_data)
            message_event = dict(
                realm_id=realm.id,
                stream_name='whatever',
            )

            client_info = get_client_info_for_message_event(
                message_event,
                users=[
                    dict(id=cordelia.id),
                ],
            )

            self.assertEqual(len(client_info), 0)

            client_info = get_client_info_for_message_event(
                message_event,
                users=[
                    dict(id=cordelia.id),
                    dict(id=hamlet.id, flags=['mentioned']),
                ],
            )
            self.assertEqual(len(client_info), 1)

            dct = client_info[client.event_queue.id]
            self.assertEqual(dct['client'].apply_markdown, apply_markdown)
            self.assertEqual(dct['client'].client_gravatar, client_gravatar)
            self.assertEqual(dct['client'].user_profile_id, hamlet.id)
            self.assertEqual(dct['flags'], ['mentioned'])
            self.assertEqual(dct['is_sender'], False)

        test_get_info(apply_markdown=False, client_gravatar=False)
        test_get_info(apply_markdown=True, client_gravatar=False)

        test_get_info(apply_markdown=False, client_gravatar=True)
        test_get_info(apply_markdown=True, client_gravatar=True)

    def test_process_message_event_with_mocked_client_info(self) -> None:
        hamlet = self.example_user("hamlet")

        class MockClient:
            def __init__(self, user_profile_id: int,
                         apply_markdown: bool,
                         client_gravatar: bool) -> None:
                self.user_profile_id = user_profile_id
                self.apply_markdown = apply_markdown
                self.client_gravatar = client_gravatar
                self.client_type_name = 'whatever'
                self.events = []  # type: List[Dict[str, Any]]

            def accepts_messages(self) -> bool:
                return True

            def accepts_event(self, event: Dict[str, Any]) -> bool:
                assert(event['type'] == 'message')
                return True

            def add_event(self, event: Dict[str, Any]) -> None:
                self.events.append(event)

        client1 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=True,
            client_gravatar=False,
        )

        client2 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=False,
            client_gravatar=False,
        )

        client3 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=True,
            client_gravatar=True,
        )

        client4 = MockClient(
            user_profile_id=hamlet.id,
            apply_markdown=False,
            client_gravatar=True,
        )

        client_info = {
            'client:1': dict(
                client=client1,
                flags=['starred'],
            ),
            'client:2': dict(
                client=client2,
                flags=['has_alert_word'],
            ),
            'client:3': dict(
                client=client3,
                flags=[],
            ),
            'client:4': dict(
                client=client4,
                flags=[],
            ),
        }

        sender = hamlet

        message_event = dict(
            message_dict=dict(
                id=999,
                content='**hello**',
                rendered_content='<b>hello</b>',
                sender_id=sender.id,
                type='stream',
                client='website',

                # NOTE: Some of these fields are clutter, but some
                #       will be useful when we let clients specify
                #       that they can compute their own gravatar URLs.
                sender_email=sender.email,
                sender_realm_id=sender.realm_id,
                sender_avatar_source=UserProfile.AVATAR_FROM_GRAVATAR,
                sender_avatar_version=1,
                sender_is_mirror_dummy=None,
                raw_display_recipient=None,
                recipient_type=None,
                recipient_type_id=None,
            ),
        )

        # Setting users to `[]` bypasses code we don't care about
        # for this test--we assume client_info is correct in our mocks,
        # and we are interested in how messages are put on event queue.
        users = []  # type: List[Any]

        with mock.patch('zerver.tornado.event_queue.get_client_info_for_message_event',
                        return_value=client_info):
            process_message_event(message_event, users)

        # We are not closely examining avatar_url at this point, so
        # just sanity check them and then delete the keys so that
        # upcoming comparisons work.
        for client in [client1, client2]:
            message = client.events[0]['message']
            self.assertIn('gravatar.com', message['avatar_url'])
            message.pop('avatar_url')

        self.assertEqual(client1.events, [
            dict(
                type='message',
                message=dict(
                    type='stream',
                    sender_id=sender.id,
                    sender_email=sender.email,
                    id=999,
                    content='<b>hello</b>',
                    content_type='text/html',
                    client='website',
                ),
                flags=['starred'],
            ),
        ])

        self.assertEqual(client2.events, [
            dict(
                type='message',
                message=dict(
                    type='stream',
                    sender_id=sender.id,
                    sender_email=sender.email,
                    id=999,
                    content='**hello**',
                    content_type='text/x-markdown',
                    client='website',
                ),
                flags=['has_alert_word'],
            ),
        ])

        self.assertEqual(client3.events, [
            dict(
                type='message',
                message=dict(
                    type='stream',
                    sender_id=sender.id,
                    sender_email=sender.email,
                    avatar_url=None,
                    id=999,
                    content='<b>hello</b>',
                    content_type='text/html',
                    client='website',
                ),
                flags=[],
            ),
        ])

        self.assertEqual(client4.events, [
            dict(
                type='message',
                message=dict(
                    type='stream',
                    sender_id=sender.id,
                    sender_email=sender.email,
                    avatar_url=None,
                    id=999,
                    content='**hello**',
                    content_type='text/x-markdown',
                    client='website',
                ),
                flags=[],
            ),
        ])

class FetchQueriesTest(ZulipTestCase):
    def test_queries(self) -> None:
        user = self.example_user("hamlet")

        self.login(user.email)

        flush_per_request_caches()
        with queries_captured() as queries:
            with mock.patch('zerver.lib.events.always_want') as want_mock:
                fetch_initial_state_data(
                    user_profile=user,
                    event_types=None,
                    queue_id='x',
                    client_gravatar=False,
                )

        self.assert_length(queries, 29)

        expected_counts = dict(
            alert_words=0,
            custom_profile_fields=1,
            default_streams=1,
            default_stream_groups=1,
            hotspots=0,
            message=1,
            muted_topics=1,
            pointer=0,
            presence=3,
            realm=0,
            realm_bot=1,
            realm_domains=1,
            realm_embedded_bots=0,
            realm_emoji=1,
            realm_filters=1,
            realm_user=3,
            realm_user_groups=2,
            stream=2,
            subscription=6,
            update_display_settings=0,
            update_global_notifications=0,
            update_message_flags=5,
            zulip_version=0,
        )

        wanted_event_types = {
            item[0][0] for item
            in want_mock.call_args_list
        }

        self.assertEqual(wanted_event_types, set(expected_counts))

        for event_type in sorted(wanted_event_types):
            count = expected_counts[event_type]
            flush_per_request_caches()
            with queries_captured() as queries:
                if event_type == 'update_message_flags':
                    event_types = ['update_message_flags', 'message']
                else:
                    event_types = [event_type]

                fetch_initial_state_data(
                    user_profile=user,
                    event_types=event_types,
                    queue_id='x',
                    client_gravatar=False,
                )
            self.assert_length(queries, count)


class TestEventsRegisterAllPublicStreamsDefaults(ZulipTestCase):
    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email

    def test_use_passed_all_public_true_default_false(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, True)
        self.assertTrue(result)

    def test_use_passed_all_public_true_default(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, True)
        self.assertTrue(result)

    def test_use_passed_all_public_false_default_false(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, False)
        self.assertFalse(result)

    def test_use_passed_all_public_false_default_true(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, False)
        self.assertFalse(result)

    def test_use_true_default_for_none(self) -> None:
        self.user_profile.default_all_public_streams = True
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, None)
        self.assertTrue(result)

    def test_use_false_default_for_none(self) -> None:
        self.user_profile.default_all_public_streams = False
        self.user_profile.save()
        result = _default_all_public_streams(self.user_profile, None)
        self.assertFalse(result)

class TestEventsRegisterNarrowDefaults(ZulipTestCase):
    def setUp(self) -> None:
        self.user_profile = self.example_user('hamlet')
        self.email = self.user_profile.email
        self.stream = get_stream('Verona', self.user_profile.realm)

    def test_use_passed_narrow_no_default(self) -> None:
        self.user_profile.default_events_register_stream_id = None
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [[u'stream', u'my_stream']])
        self.assertEqual(result, [[u'stream', u'my_stream']])

    def test_use_passed_narrow_with_default(self) -> None:
        self.user_profile.default_events_register_stream_id = self.stream.id
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [[u'stream', u'my_stream']])
        self.assertEqual(result, [[u'stream', u'my_stream']])

    def test_use_default_if_narrow_is_empty(self) -> None:
        self.user_profile.default_events_register_stream_id = self.stream.id
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [])
        self.assertEqual(result, [[u'stream', u'Verona']])

    def test_use_narrow_if_default_is_none(self) -> None:
        self.user_profile.default_events_register_stream_id = None
        self.user_profile.save()
        result = _default_narrow(self.user_profile, [])
        self.assertEqual(result, [])