test_fixtures: Add run_generate_fixtures_if_required function.

In this commit we are adding run_generate_fixtures_if_required,
a new function which is meant to de-duplicate a bit of code
between test-server and test-backend which is essentially
responsible for rebuilding the test database if that was required.

tools/lib/test_server.py

@@ -19,7 +19,7 @@ TOOLS_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 if TOOLS_DIR not in sys.path:
     sys.path.insert(0, os.path.dirname(TOOLS_DIR))
 
-from zerver.lib.test_fixtures import template_database_status
+from zerver.lib.test_fixtures import run_generate_fixtures_if_required
 
 def set_up_django(external_host):
     # type: (str) -> None
@@ -62,11 +62,7 @@ def test_server_running(force: bool=False, external_host: str='testserver',
     set_up_django(external_host)
 
     if use_db:
-        generate_fixtures_command = ['tools/setup/generate-fixtures']
-        test_template_db_status = template_database_status()
-        if test_template_db_status == 'needs_rebuild':
-            generate_fixtures_command.append('--force')
-        subprocess.check_call(generate_fixtures_command)
+        run_generate_fixtures_if_required()
 
     # Run this not through the shell, so that we have the actual PID.
     run_dev_server_command = ['tools/run-dev.py', '--test']

tools/test-backend

@@ -171,7 +171,7 @@ if __name__ == "__main__":
     os.environ["http_proxy"] = ""
     os.environ["https_proxy"] = ""
 
-    from zerver.lib.test_fixtures import template_database_status
+    from zerver.lib.test_fixtures import run_generate_fixtures_if_required
 
     from tools.lib.test_script import (
         get_provisioning_status,
@@ -344,11 +344,7 @@ if __name__ == "__main__":
     # files, since part of setup is importing the models for all applications in INSTALLED_APPS.
     django.setup()
 
-    test_template_db_status = template_database_status()
-    if options.generate_fixtures or test_template_db_status == 'needs_rebuild':
-        generate_fixtures_command = [os.path.join(TOOLS_DIR, 'setup', 'generate-fixtures')]
-        generate_fixtures_command.append('--force')
-        subprocess.call(generate_fixtures_command)
+    run_generate_fixtures_if_required(options.generate_fixtures)
 
     subprocess.check_call(['tools/webpack', '--test'])
 

zerver/lib/test_fixtures.py

@@ -3,6 +3,7 @@ import json
 import os
 import re
 import hashlib
+import subprocess
 import sys
 from typing import Any, List, Optional
 from importlib import import_module
@@ -21,6 +22,13 @@ from scripts.lib.zulip_tools import get_dev_uuid_var_path
 UUID_VAR_DIR = get_dev_uuid_var_path()
 FILENAME_SPLITTER = re.compile('[\W\-_]')
 
+def run_generate_fixtures_if_required(use_force: bool=False) -> None:
+    generate_fixtures_command = ['tools/setup/generate-fixtures']
+    test_template_db_status = template_database_status()
+    if use_force or test_template_db_status == 'needs_rebuild':
+        generate_fixtures_command.append('--force')
+    subprocess.check_call(generate_fixtures_command)
+
 def database_exists(database_name: str, **options: Any) -> bool:
     db = options.get('database', DEFAULT_DB_ALIAS)
     try: