zulip/frontend_tests/node_tests/ui.js

const ui = zrequire('ui');
set_global('i18n', global.stub_i18n);

set_global('navigator', {
    userAgent: '',
});

run_test('get_hotkey_deprecation_notice', () => {
    const expected = 'translated: We\'ve replaced the "*" hotkey with "Ctrl + s" to make this common shortcut easier to trigger.';
    const actual = ui.get_hotkey_deprecation_notice('*', 'Ctrl + s');
    assert.equal(expected, actual);
});

run_test('get_hotkey_deprecation_notice_mac', () => {
    global.navigator.userAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36";
    const expected = 'translated: We\'ve replaced the "*" hotkey with "Cmd + s" to make this common shortcut easier to trigger.';
    const actual = ui.get_hotkey_deprecation_notice('*', 'Cmd + s');
    assert.equal(expected, actual);
    // Reset userAgent
    global.navigator.userAgent = '';
});