<!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>
