Add test for useLocalMedia

assets/src/edit-story/app/media/local/test/useLocalMedia.js

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * External dependencies
+ */
+import { renderHook } from '@testing-library/react-hooks';
+
+/**
+ * Internal dependencies
+ */
+import useLocalMedia from '../useLocalMedia';
+import MediaContext from '../../../../app/media/context';
+
+describe('useLocalMedia', () => {
+  function renderUseLocalMedia(mediaContextValue, selector) {
+    const wrapper = (params) => (
+      <MediaContext.Provider value={mediaContextValue}>
+        {params.children}
+      </MediaContext.Provider>
+    );
+
+    const { result } = renderHook(() => useLocalMedia(selector), { wrapper });
+    return result.current;
+  }
+
+  it('should return state for local media', () => {
+    const state = renderUseLocalMedia({
+      local: {
+        sampleLocalState1: 'value1',
+        sampleLocalState2: 'value2',
+      },
+    });
+    expect(state).toStrictEqual({
+      sampleLocalState1: 'value1',
+      sampleLocalState2: 'value2',
+    });
+  });
+
+  it('should return state for local media when using a selector', () => {
+    const state = renderUseLocalMedia(
+      {
+        local: {
+          sampleLocalState1: 'value1',
+          sampleLocalState2: 'value2',
+        },
+      },
+      ({ sampleLocalState2 }) => ({ sampleLocalState2 })
+    );
+    expect(state).toStrictEqual({
+      sampleLocalState2: 'value2',
+    });
+  });
+});