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diff --git a/spec/frontend/deploy_freeze/store/mutations_spec.js b/spec/frontend/deploy_freeze/store/mutations_spec.js
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+++ b/spec/frontend/deploy_freeze/store/mutations_spec.js
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+import state from '~/deploy_freeze/store/state';
+import mutations from '~/deploy_freeze/store/mutations';
+import * as types from '~/deploy_freeze/store/mutation_types';
+import { mockFreezePeriods, mockTimezoneData } from '../mock_data';
+
+describe('CI variable list mutations', () => {
+  let stateCopy;
+  beforeEach(() => {
+    stateCopy = state({
+      projectId: '8',
+      timezoneData: mockTimezoneData,
+    });
+  });
+
+  describe('RESET_MODAL', () => {
+    it('should reset modal state', () => {
+      mutations[types.RESET_MODAL](stateCopy);
+
+      expect(stateCopy.freezeStartCron).toBe('');
+      expect(stateCopy.freezeEndCron).toBe('');
+      expect(stateCopy.selectedTimezone).toBe('');
+      expect(stateCopy.selectedTimezoneIdentifier).toBe('');
+    });
+  });
+
+  describe('RECEIVE_FREEZE_PERIODS_SUCCESS', () => {
+    it('should set environments', () => {
+      mutations[types.RECEIVE_FREEZE_PERIODS_SUCCESS](stateCopy, mockFreezePeriods);
+
+      expect(stateCopy.freezePeriods).toEqual(mockFreezePeriods);
+    });
+  });
+
+  describe('SET_SELECTED_TIMEZONE', () => {
+    it('should set the cron timezone', () => {
+      const timezone = {
+        formattedTimezone: '[UTC -7] Pacific Time (US & Canada)',
+        identifier: 'America/Los_Angeles',
+      };
+      mutations[types.SET_SELECTED_TIMEZONE](stateCopy, timezone);
+
+      expect(stateCopy.selectedTimezone).toEqual(timezone.formattedTimezone);
+      expect(stateCopy.selectedTimezoneIdentifier).toEqual(timezone.identifier);
+    });
+  });
+
+  describe('SET_FREEZE_START_CRON', () => {
+    it('should set freezeStartCron', () => {
+      mutations[types.SET_FREEZE_START_CRON](stateCopy, '5 0 * 8 *');
+
+      expect(stateCopy.freezeStartCron).toBe('5 0 * 8 *');
+    });
+  });
+
+  describe('SET_FREEZE_ENDT_CRON', () => {
+    it('should set freezeEndCron', () => {
+      mutations[types.SET_FREEZE_END_CRON](stateCopy, '5 0 * 8 *');
+
+      expect(stateCopy.freezeEndCron).toBe('5 0 * 8 *');
+    });
+  });
+});