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diff --git a/spec/frontend/vue_shared/components/timezone_dropdown/timezone_dropdown_spec.js b/spec/frontend/vue_shared/components/timezone_dropdown/timezone_dropdown_spec.js
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+import { GlDropdownItem, GlDropdown } from '@gitlab/ui';
+import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
+import TimezoneDropdown from '~/vue_shared/components/timezone_dropdown/timezone_dropdown.vue';
+import { formatTimezone } from '~/lib/utils/datetime_utility';
+import { findTzByName, timezoneDataFixture } from './helpers';
+
+describe('Deploy freeze timezone dropdown', () => {
+  let wrapper;
+  let store;
+
+  const createComponent = (searchTerm, selectedTimezone) => {
+    wrapper = shallowMountExtended(TimezoneDropdown, {
+      store,
+      propsData: {
+        value: selectedTimezone,
+        timezoneData: timezoneDataFixture,
+        name: 'user[timezone]',
+      },
+    });
+
+    // setData usage is discouraged. See https://gitlab.com/groups/gitlab-org/-/epics/7330 for details
+    // eslint-disable-next-line no-restricted-syntax
+    wrapper.setData({ searchTerm });
+  };
+
+  const findAllDropdownItems = () => wrapper.findAllComponents(GlDropdownItem);
+  const findDropdownItemByIndex = (index) => wrapper.findAllComponents(GlDropdownItem).at(index);
+  const findEmptyResultsItem = () => wrapper.findByTestId('noMatchingResults');
+  const findHiddenInput = () => wrapper.find('input');
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('No time zones found', () => {
+    beforeEach(() => {
+      createComponent('UTC timezone');
+    });
+
+    it('renders empty results message', () => {
+      expect(findDropdownItemByIndex(0).text()).toBe('No matching results');
+    });
+  });
+
+  describe('Search term is empty', () => {
+    beforeEach(() => {
+      createComponent('');
+    });
+
+    it('renders all timezones when search term is empty', () => {
+      expect(findAllDropdownItems()).toHaveLength(timezoneDataFixture.length);
+    });
+  });
+
+  describe('Time zones found', () => {
+    beforeEach(() => {
+      createComponent('Alaska');
+    });
+
+    it('renders only the time zone searched for', () => {
+      const selectedTz = findTzByName('Alaska');
+      expect(findAllDropdownItems()).toHaveLength(1);
+      expect(findDropdownItemByIndex(0).text()).toBe(formatTimezone(selectedTz));
+    });
+
+    it('should not display empty results message', () => {
+      expect(findEmptyResultsItem().exists()).toBe(false);
+    });
+
+    describe('Custom events', () => {
+      const selectedTz = findTzByName('Alaska');
+
+      it('should emit input if a time zone is clicked', () => {
+        findDropdownItemByIndex(0).vm.$emit('click');
+        expect(wrapper.emitted('input')).toEqual([
+          [
+            {
+              formattedTimezone: formatTimezone(selectedTz),
+              identifier: selectedTz.identifier,
+            },
+          ],
+        ]);
+      });
+    });
+  });
+
+  describe('Selected time zone not found', () => {
+    beforeEach(() => {
+      createComponent('', 'Berlin');
+    });
+
+    it('renders empty selections', () => {
+      expect(wrapper.findComponent(GlDropdown).props().text).toBe('Select timezone');
+    });
+
+    it('preserves initial value in the associated input', () => {
+      expect(findHiddenInput().attributes('value')).toBe('Berlin');
+    });
+  });
+
+  describe('Selected time zone found', () => {
+    beforeEach(() => {
+      createComponent('', 'Europe/Berlin');
+    });
+
+    it('renders selected time zone as dropdown label', () => {
+      expect(wrapper.findComponent(GlDropdown).props().text).toBe('[UTC + 2] Berlin');
+    });
+  });
+});