video.js/test/unit/tracks/text-track-display.test.js

/* eslint-env qunit */
import Html5 from '../../../src/js/tech/html5.js';
import Component from '../../../src/js/component.js';

import * as browser from '../../../src/js/utils/browser.js';
import TestHelpers from '../test-helpers.js';
import document from 'global/document';
import sinon from 'sinon';

QUnit.module('Text Track Display', {
  beforeEach(assert) {
    this.clock = sinon.useFakeTimers();
  },
  afterEach(assert) {
    this.clock.restore();
  }
});

const getMenuItemByLanguage = function(items, language) {
  for (let i = items.length - 1; i > 0; i--) {
    const captionMenuItem = items[i];
    const trackLanguage = captionMenuItem.track.language;

    if (trackLanguage && trackLanguage === language) {
      return captionMenuItem;
    }
  }
};

QUnit.test('if native text tracks are not supported, create a texttrackdisplay', function(assert) {
  const oldTestVid = Html5.TEST_VID;
  const oldIsFirefox = browser.IS_FIREFOX;
  const oldTextTrackDisplay = Component.getComponent('TextTrackDisplay');
  const tag = document.createElement('video');
  const track1 = document.createElement('track');
  const track2 = document.createElement('track');

  track1.kind = 'captions';
  track1.label = 'en';
  track1.language = 'English';
  track1.src = 'en.vtt';
  tag.appendChild(track1);

  track2.kind = 'captions';
  track2.label = 'es';
  track2.language = 'Spanish';
  track2.src = 'es.vtt';
  tag.appendChild(track2);

  Html5.TEST_VID = {
    textTracks: []
  };

  browser.IS_FIREFOX = true;

  const fakeTTDSpy = sinon.spy();

  class FakeTTD extends Component {
    constructor() {
      super();
      fakeTTDSpy();
    }
  }

  Component.registerComponent('TextTrackDisplay', FakeTTD);

  const player = TestHelpers.makePlayer({}, tag);

  assert.strictEqual(fakeTTDSpy.callCount, 1, 'text track display was created');

  Html5.TEST_VID = oldTestVid;
  browser.IS_FIREFOX = oldIsFirefox;
  Component.registerComponent('TextTrackDisplay', oldTextTrackDisplay);

  player.dispose();
});

QUnit.test('shows the default caption track first', function(assert) {
  const player = TestHelpers.makePlayer();
  const track1 = {
    kind: 'captions',
    label: 'English',
    language: 'en',
    src: 'en.vtt',
    default: true
  };
  const track2 = {
    kind: 'captions',
    label: 'Spanish',
    language: 'es',
    src: 'es.vtt'
  };

  // Add the text tracks
  const englishTrack = player.addRemoteTextTrack(track1).track;
  const spanishTrack = player.addRemoteTextTrack(track2).track;

  // Make sure the ready handler runs
  this.clock.tick(1);

  assert.ok(englishTrack.mode === 'showing', 'English track should be showing');
  assert.ok(spanishTrack.mode === 'disabled', 'Spanish track should not be showing');
  player.dispose();
});

if (!Html5.supportsNativeTextTracks()) {
  QUnit.test('selectedlanguagechange is triggered by a track mode change', function(assert) {
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };
    const spy = sinon.spy();
    const selectedLanguageHandler = function(event) {
      spy();
    };
    const englishTrack = player.addRemoteTextTrack(track1).track;

    player.textTracks().addEventListener('selectedlanguagechange', selectedLanguageHandler);
    englishTrack.mode = 'showing';

    assert.strictEqual(spy.callCount, 1, 'selectedlanguagechange event was fired');
    player.dispose();
  });

  QUnit.test("if user-selected language is unavailable, don't pick a track to show", function(assert) {
    // The video has no default language but has ‘English’ captions only
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };
    const captionsButton = player.controlBar.getChild('SubsCapsButton');

    player.src({type: 'video/mp4', src: 'http://google.com'});
    // manualCleanUp = true by default
    const englishTrack = player.addRemoteTextTrack(track1).track;

    // Force 'es' as user-selected track
    player.cache_.selectedLanguage = { language: 'es', kind: 'captions' };

    this.clock.tick(1);
    player.play();

    assert.ok(!captionsButton.hasClass('vjs-hidden'), 'The captions button is shown');
    assert.ok(englishTrack.mode === 'disabled', 'English track should be disabled');
    player.dispose();
  });

  QUnit.test('the user-selected language takes priority over default language', function(assert) {
    // The video has ‘English’ captions as default, but has ‘Spanish’ captions also
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt',
      default: true
    };
    const track2 = {
      kind: 'captions',
      label: 'Spanish',
      language: 'es',
      src: 'es.vtt'
    };

    player.src({type: 'video/mp4', src: 'http://google.com'});
    // manualCleanUp = true by default
    const englishTrack = player.addRemoteTextTrack(track1).track;
    const spanishTrack = player.addRemoteTextTrack(track2).track;

    // Force 'es' as user-selected track
    player.cache_.selectedLanguage = { enabled: true, language: 'es', kind: 'captions' };
    this.clock.tick(1);

    assert.ok(spanishTrack.mode === 'showing', 'Spanish captions should be shown');
    assert.ok(englishTrack.mode === 'disabled', 'English captions should be hidden');
    player.dispose();
  });

  QUnit.test("matching both the selectedLanguage's language and kind takes priority over just matching the language", function(assert) {
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };
    const track2 = {
      kind: 'subtitles',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };

    player.src({type: 'video/mp4', src: 'http://google.com'});
    // manualCleanUp = true by default
    const captionTrack = player.addRemoteTextTrack(track1).track;
    const subsTrack = player.addRemoteTextTrack(track2).track;

    // Force English captions as user-selected track
    player.cache_.selectedLanguage = { enabled: true, language: 'en', kind: 'captions' };
    this.clock.tick(1);

    assert.ok(captionTrack.mode === 'showing', 'Captions track should be preselected');
    assert.ok(subsTrack.mode === 'disabled', 'Subtitles track should remain disabled');
    player.dispose();
  });

  QUnit.test('the user-selected language is used for subsequent source changes', function(assert) {
    // Start with two captions tracks: English and Spanish
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };
    const track2 = {
      kind: 'captions',
      label: 'Spanish',
      language: 'es',
      src: 'es.vtt'
    };
    const tracks = player.tech_.remoteTextTracks();
    const captionsButton = player.controlBar.getChild('SubsCapsButton');
    let esCaptionMenuItem;
    let enCaptionMenuItem;

    player.src({type: 'video/mp4', src: 'http://google.com'});
    // manualCleanUp = true by default
    player.addRemoteTextTrack(track1);
    player.addRemoteTextTrack(track2);

    // Keep track of menu items
    esCaptionMenuItem = getMenuItemByLanguage(captionsButton.items, 'es');
    enCaptionMenuItem = getMenuItemByLanguage(captionsButton.items, 'en');

    // The user chooses Spanish
    player.play();
    esCaptionMenuItem.trigger('click');

    // Track mode changes on user-selection
    assert.ok(esCaptionMenuItem.track.mode === 'showing',
      'Spanish should be showing after selection');
    assert.ok(enCaptionMenuItem.track.mode === 'disabled',
      'English should be disabled after selecting Spanish');
    assert.deepEqual(player.cache_.selectedLanguage,
      { enabled: true, language: 'es', kind: 'captions' });

    // Switch source and remove old tracks
    player.tech_.src({type: 'video/mp4', src: 'http://example.com'});
    while (tracks.length > 0) {
      player.removeRemoteTextTrack(tracks[0]);
    }
    // Add tracks for the new source
    // change the kind of track to subtitles
    track1.kind = 'subtitles';
    track2.kind = 'subtitles';
    const englishTrack = player.addRemoteTextTrack(track1).track;
    const spanishTrack = player.addRemoteTextTrack(track2).track;

    // Make sure player ready handler runs
    this.clock.tick(1);

    // Keep track of menu items
    esCaptionMenuItem = getMenuItemByLanguage(captionsButton.items, 'es');
    enCaptionMenuItem = getMenuItemByLanguage(captionsButton.items, 'en');

    // The user-selection should have persisted
    assert.ok(esCaptionMenuItem.track.mode === 'showing',
      'Spanish should remain showing');
    assert.ok(enCaptionMenuItem.track.mode === 'disabled',
      'English should remain disabled');
    assert.deepEqual(player.cache_.selectedLanguage,
      { enabled: true, language: 'es', kind: 'captions' });

    assert.ok(spanishTrack.mode === 'showing', 'Spanish track remains showing');
    assert.ok(englishTrack.mode === 'disabled', 'English track remains disabled');
    player.dispose();
  });

  QUnit.test('the user-selected language is cleared on turning off captions', function(assert) {
    const player = TestHelpers.makePlayer();
    const track1 = {
      kind: 'captions',
      label: 'English',
      language: 'en',
      src: 'en.vtt'
    };
    const captionsButton = player.controlBar.getChild('SubsCapsButton');
    // we know the postition of the OffTextTrackMenuItem
    const offMenuItem = captionsButton.items[1];

    player.src({type: 'video/mp4', src: 'http://google.com'});
    // manualCleanUp = true by default
    const englishTrack = player.addRemoteTextTrack(track1).track;
    // Keep track of menu items
    const enCaptionMenuItem = getMenuItemByLanguage(captionsButton.items, 'en');

    // Select English initially
    player.play();
    enCaptionMenuItem.trigger('click');

    assert.deepEqual(player.cache_.selectedLanguage,
      { enabled: true, language: 'en', kind: 'captions' }, 'English track is selected');
    assert.ok(englishTrack.mode === 'showing', 'English track should be showing');

    // Select the off button
    offMenuItem.trigger('click');

    assert.deepEqual(player.cache_.selectedLanguage,
      { enabled: false }, 'selectedLanguage is cleared');
    assert.ok(englishTrack.mode === 'disabled', 'English track is disabled');
    player.dispose();
  });

}