hashchange-same-fragment-does-not-fire.html

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/browsing-the-web/history-traversal/hashchange-same-fragment-does-not-fire.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>hashchange is not fired when setting the same fragment</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script>

promise_test(async t => {

  t.add_cleanup(() => history.replaceState(null, "", location.pathname + location.search));

  const first = new Promise(resolve => addEventListener("hashchange", resolve, { once: true }));

  location.hash = "#foo";

  await first;

  const secondHashchange = new Promise(resolve => {

    addEventListener("hashchange", () => resolve("fired"), { once: true });

});

  const timeout = new Promise(resolve => t.step_timeout(() => resolve("timeout"), 100));

  location.hash = "#foo";

  const result = await Promise.race([secondHashchange, timeout]);

  assert_equals(result, "timeout", "hashchange must not fire when fragment does not change");

}, "Setting the same location.hash twice must not fire hashchange the second time");

</script>