1 files changed, 29 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations.getImageData.worker.js b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations.getImageData.worker.js
new file mode 100644
index 0000000000..6a1a16fccb
--- /dev/null
+++ b/testing/web-platform/tests/html/canvas/offscreen/layers/2d.layer.malformed-operations.getImageData.worker.js
@@ -0,0 +1,29 @@
+// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py.
+// OffscreenCanvas test in a worker:2d.layer.malformed-operations.getImageData
+// 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");
+
+var t = async_test("Check that exceptions are thrown for operations that are malformed while layers are open.");
+var t_pass = t.done.bind(t);
+var t_fail = t.step_func(function(reason) {
+    throw reason;
+});
+t.step(function() {
+
+  var canvas = new OffscreenCanvas(200, 200);
+  var ctx = canvas.getContext('2d');
+
+  // Shouldn't throw on its own.
+  ctx.getImageData(0, 0, 200, 200);
+  // Make sure the exception isn't caused by calling the function twice.
+  ctx.getImageData(0, 0, 200, 200);
+  // Calling again inside a layer should throw.
+  ctx.beginLayer();
+  assert_throws_dom("InvalidStateError",
+                    () => ctx.getImageData(0, 0, 200, 200));
+  t.done();
+});
+done();