2d.layer.malformed-operations-with-promises.html

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.layer.malformed-operations-with-promises</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">

<h1>2d.layer.malformed-operations-with-promises</h1>

<script>

promise_test(async t => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  // Shouldn't throw on its own.
  await createImageBitmap(canvas);
  // Make sure the exception isn't caused by calling the function twice.
  await createImageBitmap(canvas);
  // Calling again inside a layer should throw.
  ctx.beginLayer();
  await promise_rejects_dom(t, 'InvalidStateError',
                            createImageBitmap(canvas));
}, "Throws if createImageBitmap is called while layers are open.");

promise_test(async t => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  // Shouldn't throw on its own.
  await new Promise(resolve => canvas.toBlob(resolve));
  // Make sure the exception isn't caused by calling the function twice.
  await new Promise(resolve => canvas.toBlob(resolve));
  // Calling again inside a layer should throw.
  ctx.beginLayer();
  await promise_rejects_dom(t, 'InvalidStateError',
                            new Promise(resolve => canvas.toBlob(resolve)));
}, "Throws if toBlob is called while layers are open.");

</script>
</div>
chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/layers/2d.layer.malformed-operations-with-promises.html
