diff --git a/.eslintrc.json b/.eslintrc.json
index fd283e1bc9..a59acbc5b6 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -68,6 +68,7 @@
         "hash_util": false,
         "hashchange": false,
         "helpers": false,
+        "history": false,
         "home_msg_list": false,
         "hotspots": false,
         "i18n": false,
@@ -85,6 +86,7 @@
         "localStorage": false,
         "local_message": false,
         "localstorage": false,
+        "location": false,
         "markdown": false,
         "marked": false,
         "md5": false,
diff --git a/frontend_tests/node_tests/billing_helpers.js b/frontend_tests/node_tests/billing_helpers.js
index 693db7a28a..c57c0f8182 100644
--- a/frontend_tests/node_tests/billing_helpers.js
+++ b/frontend_tests/node_tests/billing_helpers.js
@@ -1,4 +1,237 @@
+const { JSDOM } = require("jsdom");
+const fs = require("fs");
+const template = fs.readFileSync("templates/corporate/upgrade.html", "utf-8");
+const dom = new JSDOM(template, { pretendToBeVisual: true });
+var jquery = require('jquery')(dom.window);
+
 set_global('$', global.make_zjquery());
 set_global('page_params', {});
+set_global('loading', {});
+set_global('history', {});
+set_global('document', {
+    title: "Zulip",
+});
+set_global('location', {
+    pathname: "/upgrade/",
+    search: "",
+    hash: "#billing",
+});
 
 zrequire('helpers', "js/billing/helpers");
+
+run_test('create_ajax_request', () => {
+    var form_loading_indicator = "#autopay_loading_indicator";
+    var form_input_section = "#autopay-input-section";
+    var form_success = "#autopay-success";
+    var form_error = "#autopay-error";
+    var form_loading = "#autopay-loading";
+
+    var state = {
+        form_input_section_show: 0,
+        form_input_section_hide: 0,
+        form_error_show: 0,
+        form_error_hide: 0,
+        form_loading_show: 0,
+        form_loading_hide: 0,
+        form_success_show: 0,
+        location_reload: 0,
+        pushState: 0,
+        make_indicator: 0,
+    };
+
+    loading.make_indicator = function (loading_indicator, config) {
+        assert.equal(loading_indicator.selector, form_loading_indicator);
+        assert.equal(config.text, "Processing ...");
+        assert.equal(config.abs_positioned, true);
+        state.make_indicator += 1;
+    };
+
+    $(form_input_section).hide = function () {
+        state.form_input_section_hide += 1;
+    };
+
+    $(form_input_section).show = function () {
+        state.form_input_section_show += 1;
+    };
+
+    $(form_error).hide = function () {
+        state.form_error_hide += 1;
+    };
+
+    $(form_error).show = function () {
+        state.form_error_show += 1;
+        return {
+            text: (msg) => {
+                assert.equal(msg, "response_message");
+            },
+        };
+    };
+
+    $(form_success).show = function () {
+        state.form_success_show += 1;
+    };
+
+    $(form_loading).show = function () {
+        state.form_loading_show += 1;
+    };
+
+    $(form_loading).hide = function () {
+        state.form_loading_hide += 1;
+    };
+
+    $("#autopay-form").serializeArray = () => {
+        return jquery("#autopay-form").serializeArray();
+    };
+
+    $.post = ({url, data, success, error}) => {
+        assert.equal(state.form_input_section_hide, 1);
+        assert.equal(state.form_error_hide, 1);
+        assert.equal(state.form_loading_show, 1);
+        assert.equal(state.make_indicator, 1);
+
+        assert.equal(url, "/json/billing/upgrade");
+
+        assert.equal(Object.keys(data).length, 8);
+        assert.equal(data.stripe_token, '"stripe_token_id"');
+        assert.equal(data.seat_count, '"{{ seat_count }}"');
+        assert.equal(data.signed_seat_count, '"{{ signed_seat_count }}"');
+        assert.equal(data.salt, '"{{ salt }}"');
+        assert.equal(data.billing_modality, '"charge_automatically"');
+        assert.equal(data.schedule, '"annual"');
+        assert.equal(data.license_management, '"automatic"');
+        assert.equal(data.licenses, '');
+
+        history.pushState = (state_object, title, path) => {
+            state.pushState += 1;
+            assert.equal(state_object, "");
+            assert.equal(title, "Zulip");
+            assert.equal(path, "/upgrade/");
+        };
+
+        location.reload = () => {
+            state.location_reload += 1;
+        };
+
+        success();
+
+        assert.equal(state.location_reload, 1);
+        assert.equal(state.pushState, 1);
+        assert.equal(state.form_success_show, 1);
+        assert.equal(state.form_error_hide, 2);
+        assert.equal(state.form_loading_hide, 1);
+
+        error({responseText: '{"msg": "response_message"}'});
+
+        assert.equal(state.form_loading_hide, 2);
+        assert.equal(state.form_error_show, 1);
+        assert.equal(state.form_input_section_show, 1);
+    };
+
+    helpers.create_ajax_request("/json/billing/upgrade", "autopay", {id: "stripe_token_id"});
+
+});
+
+run_test("format_money", () => {
+    assert.equal(helpers.format_money("100"), "1");
+    assert.equal(helpers.format_money("123.00"), "1.23");
+    assert.equal(helpers.format_money("123.45"), "1.24");
+    assert.equal(helpers.format_money("600"), "6");
+    assert.equal(helpers.format_money("640"), "6.40");
+    assert.equal(helpers.format_money("666.6666666666666"), "6.67");
+    assert.equal(helpers.format_money("7600"), "76");
+    assert.equal(helpers.format_money("8000"), "80");
+    assert.equal(helpers.format_money("123416.323"), "1234.17");
+    assert.equal(helpers.format_money("927268238"), "9272682.38");
+});
+
+run_test("update_charged_amount", () => {
+    var prices = {};
+    prices.annual = 8000;
+    prices.monthly = 800;
+    page_params.seat_count = 35;
+
+    helpers.update_charged_amount(prices, "annual");
+    assert.equal($("#charged_amount").text(), 80 * 35);
+
+    helpers.update_charged_amount(prices, "monthly");
+    assert.equal($("#charged_amount").text(), 8 * 35);
+});
+
+run_test("show_license_section", () => {
+    var state = {
+        show_license_automatic_section: 0,
+        show_license_manual_section: 0,
+        hide_license_automatic_section: 0,
+        hide_license_manual_section: 0,
+    };
+
+    $("#license-automatic-section").show = () => {
+        state.show_license_automatic_section += 1;
+    };
+
+    $("#license-manual-section").show = () => {
+        state.show_license_manual_section += 1;
+    };
+
+    $("#license-automatic-section").hide = () => {
+        state.hide_license_automatic_section += 1;
+    };
+
+    $("#license-manual-section").hide = () => {
+        state.hide_license_manual_section += 1;
+    };
+
+    helpers.show_license_section("automatic");
+
+    assert.equal(state.hide_license_automatic_section, 1);
+    assert.equal(state.hide_license_manual_section, 1);
+    assert.equal(state.show_license_automatic_section, 1);
+    assert.equal(state.show_license_manual_section, 0);
+    assert.equal($("#automatic_license_count").prop('disabled'), false);
+    assert.equal($("#manual_license_count").prop('disabled'), true);
+
+    helpers.show_license_section("manual");
+
+    assert.equal(state.hide_license_automatic_section, 2);
+    assert.equal(state.hide_license_manual_section, 2);
+    assert.equal(state.show_license_automatic_section, 1);
+    assert.equal(state.show_license_manual_section, 1);
+    assert.equal($("#automatic_license_count").prop('disabled'), true);
+    assert.equal($("#manual_license_count").prop('disabled'), false);
+});
+
+run_test("set_tab", () => {
+    var state = {
+        show_tab_billing: 0,
+        show_tab_payment_method: 0,
+        scrollTop: 0,
+    };
+
+    $('#upgrade-tabs.nav a[href="#billing"]').tab = (action) => {
+        state.show_tab_billing += 1;
+        assert.equal(action, "show");
+    };
+
+    $('#upgrade-tabs.nav a[href="#payment-method"]').tab = (action) => {
+        state.show_tab_payment_method += 1;
+        assert.equal(action, "show");
+    };
+
+    $("html").scrollTop = (val) => {
+        state.scrollTop += 1;
+        assert.equal(val, 0);
+    };
+
+    helpers.set_tab("upgrade");
+    assert.equal(state.show_tab_billing, 1);
+    assert.equal(state.scrollTop, 1);
+
+    const click_handler = $("#upgrade-tabs.nav-tabs a").get_on_handler("click");
+    click_handler.call({hash: "#payment-method"});
+    assert.equal(location.hash, "#payment-method");
+
+    const hash_change_handler = window.onhashchange;
+    hash_change_handler();
+    assert.equal(state.show_tab_payment_method, 1);
+    assert.equal(state.scrollTop, 2);
+});
diff --git a/frontend_tests/zjsunit/zjquery.js b/frontend_tests/zjsunit/zjquery.js
index 67efd76ac0..9e1efaf950 100644
--- a/frontend_tests/zjsunit/zjquery.js
+++ b/frontend_tests/zjsunit/zjquery.js
@@ -309,6 +309,9 @@ exports.make_new_elem = function (selector, opts) {
         replaceWith: function () {
             return self;
         },
+        scrollTop: function () {
+            return self;
+        },
         select: function (arg) {
             event_store.generic_event('select', arg);
             return self;
@@ -320,6 +323,9 @@ exports.make_new_elem = function (selector, opts) {
             shown = true;
             return self;
         },
+        serializeArray: function () {
+            return self;
+        },
         set_parent: function (parent_elem) {
             my_parent = parent_elem;
         },