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diff --git a/spec/frontend/frequent_items/store/mutations_spec.js b/spec/frontend/frequent_items/store/mutations_spec.js
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+import state from '~/frequent_items/store/state';
+import mutations from '~/frequent_items/store/mutations';
+import * as types from '~/frequent_items/store/mutation_types';
+import {
+  mockNamespace,
+  mockStorageKey,
+  mockFrequentProjects,
+  mockSearchedProjects,
+  mockProcessedSearchedProjects,
+  mockSearchedGroups,
+  mockProcessedSearchedGroups,
+} from '../mock_data';
+
+describe('Frequent Items dropdown mutations', () => {
+  let stateCopy;
+
+  beforeEach(() => {
+    stateCopy = state();
+  });
+
+  describe('SET_NAMESPACE', () => {
+    it('should set namespace', () => {
+      mutations[types.SET_NAMESPACE](stateCopy, mockNamespace);
+
+      expect(stateCopy.namespace).toEqual(mockNamespace);
+    });
+  });
+
+  describe('SET_STORAGE_KEY', () => {
+    it('should set storage key', () => {
+      mutations[types.SET_STORAGE_KEY](stateCopy, mockStorageKey);
+
+      expect(stateCopy.storageKey).toEqual(mockStorageKey);
+    });
+  });
+
+  describe('SET_SEARCH_QUERY', () => {
+    it('should set search query', () => {
+      const searchQuery = 'gitlab-ce';
+
+      mutations[types.SET_SEARCH_QUERY](stateCopy, searchQuery);
+
+      expect(stateCopy.searchQuery).toEqual(searchQuery);
+    });
+  });
+
+  describe('REQUEST_FREQUENT_ITEMS', () => {
+    it('should set view states when requesting frequent items', () => {
+      mutations[types.REQUEST_FREQUENT_ITEMS](stateCopy);
+
+      expect(stateCopy.isLoadingItems).toEqual(true);
+      expect(stateCopy.hasSearchQuery).toEqual(false);
+    });
+  });
+
+  describe('RECEIVE_FREQUENT_ITEMS_SUCCESS', () => {
+    it('should set view states when receiving frequent items', () => {
+      mutations[types.RECEIVE_FREQUENT_ITEMS_SUCCESS](stateCopy, mockFrequentProjects);
+
+      expect(stateCopy.items).toEqual(mockFrequentProjects);
+      expect(stateCopy.isLoadingItems).toEqual(false);
+      expect(stateCopy.hasSearchQuery).toEqual(false);
+      expect(stateCopy.isFetchFailed).toEqual(false);
+    });
+  });
+
+  describe('RECEIVE_FREQUENT_ITEMS_ERROR', () => {
+    it('should set items and view states when error occurs retrieving frequent items', () => {
+      mutations[types.RECEIVE_FREQUENT_ITEMS_ERROR](stateCopy);
+
+      expect(stateCopy.items).toEqual([]);
+      expect(stateCopy.isLoadingItems).toEqual(false);
+      expect(stateCopy.hasSearchQuery).toEqual(false);
+      expect(stateCopy.isFetchFailed).toEqual(true);
+    });
+  });
+
+  describe('REQUEST_SEARCHED_ITEMS', () => {
+    it('should set view states when requesting searched items', () => {
+      mutations[types.REQUEST_SEARCHED_ITEMS](stateCopy);
+
+      expect(stateCopy.isLoadingItems).toEqual(true);
+      expect(stateCopy.hasSearchQuery).toEqual(true);
+    });
+  });
+
+  describe('RECEIVE_SEARCHED_ITEMS_SUCCESS', () => {
+    it('should set items and view states when receiving searched items', () => {
+      mutations[types.RECEIVE_SEARCHED_ITEMS_SUCCESS](stateCopy, mockSearchedProjects);
+
+      expect(stateCopy.items).toEqual(mockProcessedSearchedProjects);
+      expect(stateCopy.isLoadingItems).toEqual(false);
+      expect(stateCopy.hasSearchQuery).toEqual(true);
+      expect(stateCopy.isFetchFailed).toEqual(false);
+    });
+
+    it('should also handle the different `full_name` key for namespace in groups payload', () => {
+      mutations[types.RECEIVE_SEARCHED_ITEMS_SUCCESS](stateCopy, mockSearchedGroups);
+
+      expect(stateCopy.items).toEqual(mockProcessedSearchedGroups);
+      expect(stateCopy.isLoadingItems).toEqual(false);
+      expect(stateCopy.hasSearchQuery).toEqual(true);
+      expect(stateCopy.isFetchFailed).toEqual(false);
+    });
+  });
+
+  describe('RECEIVE_SEARCHED_ITEMS_ERROR', () => {
+    it('should set view states when error occurs retrieving searched items', () => {
+      mutations[types.RECEIVE_SEARCHED_ITEMS_ERROR](stateCopy);
+
+      expect(stateCopy.items).toEqual([]);
+      expect(stateCopy.isLoadingItems).toEqual(false);
+      expect(stateCopy.hasSearchQuery).toEqual(true);
+      expect(stateCopy.isFetchFailed).toEqual(true);
+    });
+  });
+});