1 files changed, 27 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.worker.js b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.worker.js
new file mode 100644
index 0000000000..bd1e376084
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.worker.js
@@ -0,0 +1,27 @@
+// 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");
+
+var t = async_test("Checks that the context state is left unchanged if beginLayer throws.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  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());
+  t.done();
+});
+done();