audiocontext-running-onerror.html | Explore in Territory

<!doctype html>
<html>
<head>
  <title>Test AudioContext.onerror on a running AudioContext</title>
  <script src="../../resources/testharness.js"></script>
  <script src="../../resources/testharnessreport.js"></script>
</head>
<body>
  <script>
    promise_test(async () => {
      const context = new AudioContext();
      await context.resume();
      assert_equals(context.state, 'running',
                    'The initial context state should be "running".');

      let isOnErrorDispatched = false;
      let eventsDispatched = [];
      const handleDispatchedEvent = (resolve, newMessage) => {
        eventsDispatched.push(newMessage);
        if (eventsDispatched.length < 2) {
          return;
        }

        // The second `statechange` event is caused by the render error.
        assert_equals(eventsDispatched[0], 'AUDIO_CONTEXT_ERROR');
        assert_equals(eventsDispatched[1], 'AUDIO_CONTEXT_STATE_CHANGE');

        resolve();
        context.onerror = null;
        context.onstatechange = null;
        context.close();
      };

      return new Promise(async (resolve) => {
        context.onerror = () => {
          isOnErrorDispatched = true;
          handleDispatchedEvent(resolve, 'AUDIO_CONTEXT_ERROR');
        };

        context.onstatechange = () => {
          // Do not care about what happens before the error event.
          if (!isOnErrorDispatched) {
            return;
          }

          handleDispatchedEvent(resolve, 'AUDIO_CONTEXT_STATE_CHANGE');
        };

        // Trigger a fake device error.
        internals.emulateDeviceFailureOnAudioContext(context);
      });
    }, 'Test AudioContext.onerror on a running AudioContext');
  </script>
</body>
</html>
chromium/third_party/blink/web_tests/webaudio/internals/audiocontext-running-onerror.html
