constant-source-onended-not-connected.html

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This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-constantsourcenode-interface/constant-source-onended-not-connected.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

  <head>

    <title>

      AudioScheduledSourceNode fires onended when not connected to the destination

    </title>

    <script src="/resources/testharness.js"></script>

    <script src="/resources/testharnessreport.js"></script>

  </head>

  <body>

    <script id="layout-test-code">

      // A scheduled source node that is started and stopped must fire its

      // "ended" event once it reaches its stop time, even if it was never

      // connected to the destination.

      // https://webaudio.github.io/web-audio-api/#dom-audioscheduledsourcenode-onended

      const sampleRate = 44100;

      // Number of frames the source will run; fairly arbitrary.

      const numberOfFrames = 32;

      // Number of frames to render; should be larger than numberOfFrames.

      const renderFrames = 16 * numberOfFrames;

      promise_test(async () => {

        const context = new OfflineAudioContext(1, renderFrames, sampleRate);

        const source = new ConstantSourceNode(context);

        // Intentionally do not connect the source to context.destination.

        const ended = new Promise(resolve => source.onended = resolve);

        source.start();

        source.stop(numberOfFrames / context.sampleRate);

        context.startRendering();

        await ended;

      }, 'ConstantSourceNode fires onended when not connected to the destination');

    </script>

  </body>

</html>