testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations-with-promises.convertToBlob.worker.js


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// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
// OffscreenCanvas test in a worker:2d.layer.malformed-operations-with-promises.convertToBlob
// Description:Check that exceptions are thrown for operations that are malformed while layers are open.
// Note:

importScripts("/resources/testharness.js");
importScripts("/html/canvas/resources/canvas-tests.js");

promise_test(async t => {

  var canvas = new OffscreenCanvas(200, 200);
  var ctx = canvas.getContext('2d');

  // Shouldn't throw on its own.
  await canvas.convertToBlob();
  // Make sure the exception isn't caused by calling the function twice.
  await canvas.convertToBlob();
  // Calling again inside a layer should throw.
  ctx.beginLayer();
  await promise_rejects_dom(t, 'InvalidStateError', canvas.convertToBlob());
  t.done();
}, "Check that exceptions are thrown for operations that are malformed while layers are open.");
done();