<!DOCTYPE html>
<title>Test onprocessorerror handler in AudioWorkletNode</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
let context = null;

promise_setup(async () => {
  const sampleRate = 48000;
  const renderLength = sampleRate * 0.1;
  context = new OfflineAudioContext(1, renderLength, sampleRate);

  // Loads all processor definitions that are necessary for tests in this file.
  await context.audioWorklet.addModule('./processors/error-processor.js');
});

promise_test(async () => {
  const constructorErrorWorkletNode =
      new AudioWorkletNode(context, 'constructor-error');
  let error = await new Promise(resolve => {
    constructorErrorWorkletNode.onprocessorerror = (e) => resolve(e);
  });
  assert_true(error instanceof ErrorEvent,
      'onprocessorerror argument should be an ErrorEvent when ' +
      'the constructor of AudioWorkletProcessor has an error.');
}, 'Test if |onprocessorerror| is called for an exception thrown from the ' +
    'processor constructor.');

promise_test(async () => {
  // An arbitrary Blob for testing. This is not deserializable on
  // AudioWorkletGlobalScope.
  const blob = new Blob([JSON.stringify({ hello: "world"}, null, 2)], {
    type: "application/json",
  });
  const emptyErrorWorkletNode =
      new AudioWorkletNode(context, 'empty-error', {processorOptions: {blob}});
  let error = await new Promise(resolve => {
    emptyErrorWorkletNode.onprocessorerror = (e) => resolve(e);
  });
  assert_true(error instanceof ErrorEvent,
      'onprocessorerror argument should be an ErrorEvent when ' +
      'the constructor of AudioWorkletProcessor has an error.');
}, 'Test if |onprocessorerror| is called for a transfered object that cannot ' +
   'be deserialized on the AudioWorkletGlobalScope.');

promise_test(async () => {
  const processErrorWorkletNode =
      new AudioWorkletNode(context, 'process-error');
  let error = await new Promise(resolve => {
    processErrorWorkletNode.onprocessorerror = (e) => resolve(e);
    // Need to start render to cause an exception in process().
    context.startRendering();
  });
  assert_true(error instanceof ErrorEvent,
      'onprocessorerror argument should be an ErrorEvent when the ' +
      'process method of the AudioWorkletProcessor has an error.');
}, 'Test if |onprocessorerror| is called upon failure of process() method.');
</script>
