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gaia/apps/video/test/unit/captions_test.js

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+/* global Captions */
+'use strict';
+
+requireApp('/video/js/captions.js');
+
+suite('captions.js unit tests', function() {
+  var player, captions, realGetDeviceStorage;
+
+  var mockVTTFile = new Blob(['fake vtt file'], { type: 'text/vtt' });
+  var mockGetRequest;
+
+  function mockGetDeviceStorage(type) {
+    return {
+      get: function(filename) {
+        mockGetRequest.requestedFilename = filename;
+        return mockGetRequest;
+      }
+    };
+  }
+
+  setup(function() {
+    player = document.createElement('video');
+    captions = new Captions(player);
+    realGetDeviceStorage = navigator.getDeviceStorage;
+    navigator.getDeviceStorage = mockGetDeviceStorage;
+    mockGetRequest = { result: mockVTTFile };
+  });
+
+  teardown(function() {
+    navigator.getDeviceStorage = realGetDeviceStorage;
+  });
+
+  test('remove() removes track elements from player', function() {
+    player.appendChild(document.createElement('track'));
+    player.appendChild(document.createElement('track'));
+    assert.equal(player.querySelectorAll('track').length, 2);
+    captions.remove();
+    assert.equal(player.querySelectorAll('track').length, 0);
+  });
+
+  test('findAndDisplay() looks for a .vtt file', function() {
+    captions.findAndDisplay('foo/bar.mp4');
+    assert.equal(mockGetRequest.requestedFilename, 'foo/bar.vtt');
+  });
+
+  test('findAndDisplay() adds a track element if captions exist', function() {
+    captions.findAndDisplay('foo.mp4');
+    mockGetRequest.onsuccess();  // A captions file was found
+    assert.equal(player.querySelectorAll('track').length, 1);
+  });
+
+  test('findAndDisplay() adds a showing track element', function() {
+    captions.findAndDisplay('foo.mp4');
+    mockGetRequest.onsuccess();  // A captions file was found
+    assert.equal(player.querySelector('track').track.mode, 'showing');
+  });
+
+  test('findAndDisplay() adds no track element if no captions', function() {
+    captions.findAndDisplay('foo.mp4');
+    if (mockGetRequest.onerror) {
+      mockGetRequest.onerror();  // No captions file was found
+    }
+    assert.equal(player.querySelectorAll('track').length, 0);
+  });
+});