chromium/third_party/blink/web_tests/external/wpt/close-watcher/basic.html

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<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="resources/helpers.js"></script>

<body>
<script>
test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.requestClose();

  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
}, "requestClose() with no user activation");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.destroy();
  watcher.requestClose();

  assert_array_equals(events, []);
}, "destroy() then requestClose()");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.close();
  assert_array_equals(events, ["close"]);

  watcher.requestClose();
  assert_array_equals(events, ["close"]);
}, "close() then requestClose()");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.requestClose();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);

  watcher.destroy();
  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
}, "requestClose() then destroy()");

test(t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.close();
  assert_array_equals(events, ["close"]);

  watcher.destroy();
  assert_array_equals(events, ["close"]);
}, "close() then destroy()");

promise_test(async t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  watcher.destroy();
  await sendCloseRequest();

  assert_array_equals(events, []);
}, "destroy() then close request");

promise_test(async t => {
  let events = [];
  let watcher = createRecordingCloseWatcher(t, events);

  await sendCloseRequest();
  watcher.destroy();

  assert_array_equals(events, ["cancel[cancelable=false]", "close"]);
}, "Close request then destroy()");
</script>