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

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/element/layers/2d.layer.malformed-operations-with-promises.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->

<meta charset="UTF-8">

<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>