1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/window-runtime-error.html b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/window-runtime-error.html
new file mode 100644
index 0000000000..1b387ca81c
--- /dev/null
+++ b/testing/web-platform/tests/html/webappapis/scripting/events/event-handler-processing-algorithm-error/window-runtime-error.html
@@ -0,0 +1,48 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Event handlers processing algorithm: error events</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-event-handler-processing-algorithm">
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+
+<div id="log"></div>
+
+<script>
+"use strict";
+setup({ allow_uncaught_exception: true });
+
+promise_test(t => {
+  window.onerror = t.step_func((...args) => {
+    assert_greater_than(args.length, 1);
+    return true;
+  });
+
+  const eventWatcher = new EventWatcher(t, window, "error");
+  const promise = eventWatcher.wait_for("error").then(e => {
+    assert_equals(e.defaultPrevented, true);
+  });
+
+  setTimeout(() => thisFunctionDoesNotExist(), 0);
+
+  return promise;
+}, "error event is weird (return true cancels; many args) on Window, with a runtime error");
+
+promise_test(t => {
+  window.onerror = t.step_func(function (message, filename, lineno, colno, error) {
+    assert_equals(arguments.length, 5, "There must be exactly 5 arguments");
+    assert_equals(typeof message, "string", "message argument must be a string");
+    assert_equals(typeof filename, "string", "filename argument must be a string");
+    assert_equals(typeof lineno, "number", "lineno argument must be a number");
+    assert_equals(typeof colno, "number", "colno argument must be a number");
+    assert_equals(typeof error, "object", "error argument must be an object");
+    assert_equals(error.constructor, ReferenceError, "error argument must be a ReferenceError");
+    return true;
+  });
+
+  setTimeout(() => thisFunctionDoesNotExist(), 0);
+
+  const eventWatcher = new EventWatcher(t, window, "error");
+  return eventWatcher.wait_for("error");
+}, "error event has the right 5 args on Window, with a runtime error");
+</script>