video.js/test/unit/core.js

module("Core");

test('should create a video tag and have access children in old IE', function(){
  var fixture = document.getElementById('qunit-fixture');

  fixture.innerHTML += "<video id='test_vid_id'><source type='video/mp4'></video>";

  vid = document.getElementById('test_vid_id');

  ok(vid.childNodes.length === 1);
  ok(vid.childNodes[0].getAttribute('type') === 'video/mp4');
});

test('should return a video player instance', function(){
  var fixture = document.getElementById('qunit-fixture');
  fixture.innerHTML += "<video id='test_vid_id'></video><video id='test_vid_id2'></video>";

  var player = videojs('test_vid_id');
  ok(player, 'created player from tag');
  ok(player.id() === 'test_vid_id');
  ok(videojs.players['test_vid_id'] === player, 'added player to global reference')

  var playerAgain = videojs('test_vid_id');
  ok(player === playerAgain, 'did not create a second player from same tag');

  var tag2 = document.getElementById('test_vid_id2');
  var player2 = videojs(tag2);
  ok(player2.id() === 'test_vid_id2', 'created player from element');
});