third_party/WebKit/LayoutTests/webaudio/ChannelMerger/audiochannelmerger-basic.html

<!DOCTYPE html>
<html>

<head>
  <script src="../../resources/testharness.js"></script>
  <script src="../../resources/testharnessreport.js"></script> 
  <script src="../resources/audit-util.js"></script>
  <script src="../resources/audit.js"></script>
</head>

<body>
  <script>

    var audit = Audit.createTaskRunner();

    // Task: Checking constraints in ChannelMergerNode.
    audit.define('exceptions-channels', (task, should) => {
      var context = new OfflineAudioContext(2, 128, 44100);
      var merger;

      should(function () {
        merger = context.createChannelMerger();
      }, 'context.createChannelMerger()').notThrow();

      should(function () {
        merger = context.createChannelMerger(0);
      }, 'context.createChannelMerger(0)').throw('IndexSizeError');

      should(function () {
        merger = context.createChannelMerger(32);
      }, 'context.createChannelMerger(32)').notThrow();

      // Can't create a channel merger with 33 channels because the audio
      // context has a 32-channel-limit in Chrome.
      should(function () {
        merger = context.createChannelMerger(33);
      }, 'context.createChannelMerger(33)').throw('IndexSizeError');

      task.done();
    });

    // Task: checking the channel-related properties have the correct value and 
    // can't be changed.
    audit.define('exceptions-properties', (task, should) => {
      var context = new OfflineAudioContext(2, 128, 44100);
      var merger = context.createChannelMerger();

      should(merger.channelCount, 'merger.channelCount').beEqualTo(1);

      should(function () {
        merger.channelCount = 3;
      }, 'merger.channelCount = 3').throw('InvalidStateError');

      should(merger.channelCountMode, 'merger.channelCountMode').beEqualTo('explicit');

      should(function () {
        merger.channelCountMode = 'max';
      }, 'merger.channelCountMode = "max"').throw('InvalidStateError');

      task.done();
    });

    audit.run();
  </script>
</body>

</html>