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diff --git a/spec/frontend/deploy_freeze/components/timezone_dropdown_spec.js b/spec/frontend/deploy_freeze/components/timezone_dropdown_spec.js
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+++ b/spec/frontend/deploy_freeze/components/timezone_dropdown_spec.js
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+import Vuex from 'vuex';
+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import { GlDeprecatedDropdownItem, GlNewDropdown } from '@gitlab/ui';
+import TimezoneDropdown from '~/vue_shared/components/timezone_dropdown.vue';
+import createStore from '~/deploy_freeze/store';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+describe('Deploy freeze timezone dropdown', () => {
+  let wrapper;
+  let store;
+  const timezoneDataFixture = getJSONFixture('/api/freeze-periods/timezone_data.json');
+
+  const createComponent = (searchTerm, selectedTimezone) => {
+    store = createStore({
+      projectId: '8',
+      timezoneData: timezoneDataFixture,
+    });
+    wrapper = shallowMount(TimezoneDropdown, {
+      store,
+      localVue,
+      propsData: {
+        value: selectedTimezone,
+        timezoneData: timezoneDataFixture,
+      },
+    });
+
+    wrapper.setData({ searchTerm });
+  };
+
+  const findAllDropdownItems = () => wrapper.findAll(GlDeprecatedDropdownItem);
+  const findDropdownItemByIndex = index => wrapper.findAll(GlDeprecatedDropdownItem).at(index);
+
+  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', () => {
+      expect(findAllDropdownItems()).toHaveLength(1);
+      expect(findDropdownItemByIndex(0).text()).toBe('[UTC -8] Alaska');
+    });
+
+    it('should not display empty results message', () => {
+      expect(wrapper.find('[data-testid="noMatchingResults"]').exists()).toBe(false);
+    });
+
+    describe('Custom events', () => {
+      it('should emit input if a time zone is clicked', () => {
+        findDropdownItemByIndex(0).vm.$emit('click');
+        expect(wrapper.emitted('input')).toEqual([
+          [
+            {
+              formattedTimezone: '[UTC -8] Alaska',
+              identifier: 'America/Juneau',
+            },
+          ],
+        ]);
+      });
+    });
+  });
+
+  describe('Selected time zone', () => {
+    beforeEach(() => {
+      createComponent('', 'Alaska');
+    });
+
+    it('renders selected time zone as dropdown label', () => {
+      expect(wrapper.find(GlNewDropdown).vm.text).toBe('Alaska');
+    });
+  });
+});