2d.layer.exceptions-are-no-op.worker.js

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.worker.html - WPT Dashboard Interop Dashboard

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

// OffscreenCanvas test in a worker:2d.layer.exceptions-are-no-op

// Description:Checks that the context state is left unchanged if beginLayer throws.

// Note:

importScripts("/resources/testharness.js");

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

test(t => {

  var canvas = new OffscreenCanvas(100, 50);

  var ctx = canvas.getContext('2d');

  // Get `beginLayer` to throw while parsing the filter.

  assert_throws_js(TypeError,

                   () => ctx.beginLayer({filter: {name: 'colorMatrix',

                                                  values: 'foo'}}));

  // `beginLayer` shouldn't have opened the layer, so `endLayer` should throw.

  assert_throws_dom("InvalidStateError", () => ctx.endLayer());

}, "Checks that the context state is left unchanged if beginLayer throws.");

done();