Add unit test for setSource of Video

Summary: The logic of getting supported video format from video source is a little complicated, add a unit test for this.

Reviewed By: mikearmstrong001

Differential Revision: D4954548

fbshipit-source-id: 2451bfb

Author: larrylin28

ReactVR/js/Utils/__tests__/RCTVideoPlayer-test.js

@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+'use strict';
+
+jest
+  .dontMock('../RCTVideoPlayer')
+  .mock('../../Video/getSupportedFormats', () => () => ['mp4', 'mkv']);
+
+const RCTVideoPlayer = require('../RCTVideoPlayer').default;
+const rnctx = {
+  VideoModule: {
+    _addMediaEventListener: jest.fn(),
+    addHandle: jest.fn(),
+    setUrl: jest.fn(),
+    setMetaData: jest.fn(),
+    load: jest.fn(),
+    unload: jest.fn(),
+    setMuted: jest.fn(),
+    setVolume: jest.fn(),
+  },
+};
+
+describe('RCTVideoPlayer', () => {
+  it('set source to null', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource({uri: '1.mp4'});
+    player.setSource(null);
+    expect(player._source).toEqual(null);
+  });
+
+  it('set source to an empty array', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource([]);
+    expect(player._source).toEqual(null);
+  });
+
+  it('set source to a valid source', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource({uri: '1.mp4'});
+    expect(player._source).toEqual({uri: '1.mp4'});
+  });
+
+  it('choose supported formats from source', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource([{uri: '1.webm', format: 'webm'}, null, {uri: '1.mp4', format: 'mp4'}]);
+    expect(player._source).toEqual({uri: '1.mp4', format: 'mp4'});
+  });
+
+  it('order of choosing supported formats from source', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource([
+      {uri: '1.mkv', format: 'mkv', layout: 'SPHERE'},
+      {uri: '1.mp4', format: 'mp4'},
+    ]);
+    expect(player._source).toEqual({uri: '1.mkv', format: 'mkv', layout: 'SPHERE'});
+  });
+
+  it('none of the formats from source is supported', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource([{uri: '1.webm', format: 'webm'}, {uri: '1.ogg', format: 'ogg'}]);
+    expect(player._source).toEqual(null);
+  });
+
+  it('one of the source has not specify the format', () => {
+    const player = new RCTVideoPlayer(rnctx, '');
+    player.setSource([{uri: '1.webm', format: 'webm'}, {uri: '1.mov'}]);
+    expect(player._source).toEqual({uri: '1.mov'});
+  });
+});