copies & renames useSearch to useBaseSearch in kolibri-common package

prereq to learningequality#12517

packages/kolibri-common/composables/__mocks__/useBaseSearch.js

@@ -0,0 +1,88 @@
+/**
+ * `useBaseSearch` composable function mock.
+ *
+ * If default values are sufficient for tests,
+ * you only need call `jest.mock('<useBaseSearch file path>')`
+ * at the top of a test file.
+ *
+ * If you need to override some default values from some tests,
+ * you can import a helper function `useBaseSearch` that accepts
+ * an object with values to be overriden and use it together
+ * with  `mockImplementation` as follows:
+ *
+ * ```
+ * // eslint-disable-next-line import/named
+ * import useBaseSearch, { useBaseSearch } from '<useBaseSearch file path>';
+ *
+ * jest.mock('<useBaseSearch file path>')
+ *
+ * it('test', () => {
+ *   useBaseSearch.mockImplementation(
+ *     () => useBaseSearch({ classes: [{ id: 'class-1' }] })
+ *   );
+ * })
+ * ```
+ *
+ * You can reset your mock implementation back to default values
+ * for other tests by calling the following in `beforeEach`:
+ *
+ * ```
+ * useBaseSearch.mockImplementation(() => useBaseSearch())
+ * ```
+ */
+
+const MOCK_DEFAULTS = {
+  searchTerms: {
+    learning_activities: {},
+    categories: {},
+    learner_needs: {},
+    channels: {},
+    accessibility_labels: {},
+    languages: {},
+    grade_levels: {},
+  },
+  displayingSearchResults: false,
+  searchLoading: false,
+  moreLoading: false,
+  results: [],
+  more: null,
+  labels: null,
+  search: jest.fn(),
+  searchMore: jest.fn(),
+  removeFilterTag: jest.fn(),
+  clearSearch: jest.fn(),
+  currentRoute: jest.fn(() => {
+    // return a $route-flavored object to avoid undefined errors
+    return {
+      params: {},
+      query: {},
+      path: '',
+      fullPath: '',
+      name: '',
+      meta: {},
+    };
+  }),
+};
+
+export function useBaseSearch(overrides = {}) {
+  return {
+    ...MOCK_DEFAULTS,
+    ...overrides,
+  };
+}
+
+export default jest.fn(() => useBaseSearch());
+
+export const injectSearch = jest.fn(() => ({
+  availableLearningActivities: [],
+  availableLibraryCategories: [],
+  availableResourcesNeeded: [],
+  availableGradeLevels: [],
+  availableAccessibilityOptions: [],
+  availableLanguages: [],
+  availableChannels: [],
+  searchableLabels: [],
+  activeSearchTerms: [],
+}));
+
+export const searchKeys = [];