third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-commit-invalid-call.html

<!DOCTYPE>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script id="myWorker" type="text/worker">
self.onmessage = function(e) {
    var offscreenCanvas = new OffscreenCanvas(50, 50);
    var offscreen2d = offscreenCanvas.getContext("2d");
    try {
        offscreen2d.commit();
        self.postMessage("NoError");
    } catch (ex) {
        self.postMessage(ex.name);
    }
};
</script>
<script>
function makeWorker(script) {
   var blob = new Blob([script]);
   return new Worker(URL.createObjectURL(blob));
}


test(function() {
    var offscreenCanvas = new OffscreenCanvas(50, 50);
    var offscreen2d = offscreenCanvas.getContext("2d");
    assert_throws("InvalidStateError", function () {
        offscreen2d.commit();
    });
}, "Calling OffscreenCanvas.commit() on main without transferControlToOffscreen throws exception.");

async_test(function() {
    var worker = makeWorker(document.getElementById("myWorker").textContent);
    worker.onmessage = this.step_func(function (e) {
        assert_equals(e.data, "InvalidStateError", "Expected exception on worker but receives " + e.data);
        this.done();
    });
    worker.postMessage("");
}, "Calling OffscreenCanvas.commit() on worker without transferControlToOffscreen throws exception.");



</script>