dispose-same-document-navigate-during.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /navigation-api/per-entry-events/dispose-same-document-navigate-during.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<script>

promise_test(async (t) => {

  // Wait for after the load event so that the navigation doesn't get converted

  // into a replace navigation.

  await new Promise(r => window.onload = () => t.step_timeout(r, 0));

  let start_length = navigation.entries().length;

  let start_index = navigation.currentEntry.index;

  location.hash = "#1";

  location.hash = "#2";

  location.hash = "#3";

  assert_equals(navigation.entries().length, start_length + 3);

  const [entry0, entry1, entry2, entry3] = navigation.entries().slice(start_index);

  assert_equals((new URL(entry2.url)).hash, "#2");

  assert_equals((new URL(entry3.url)).hash, "#3");

  let dispose3Called = 0;

  let spoonPromise;

  entry3.addEventListener("dispose", t.step_func(e => {

    ++dispose3Called;

    spoonPromise = navigation.navigate("#spoon").committed;

  }));

  await navigation.traverseTo(entry1.key).committed;

  const forkPromise = navigation.navigate("#fork").committed;

  assert_equals(dispose3Called, 1, "dispose for entry 3 must happen exactly once (first check)")

  // The navigation to #fork will *not* be finished by the time the navigation

  // to #spoon kicks off, so the finished promise will reject. But, the

  // committed promise should still fulfill, since as we see below, #fork ends

  // up in the history list.

  await Promise.all([forkPromise, spoonPromise]);

  assert_equals(dispose3Called, 1, "dispose for entry 3 must happen exactly once (final check)");

  assert_equals(navigation.entries().length, start_length + 3);

  const [finalEntry0, finalEntry1, finalEntry2, finalEntry3] = navigation.entries().slice(start_index);

  assert_equals(finalEntry0, entry0);

  assert_equals(finalEntry1, entry1);

  assert_not_equals(finalEntry2, entry2);

  assert_not_equals(finalEntry3, entry3);

  assert_equals(navigation.currentEntry, finalEntry3);

  assert_equals((new URL(finalEntry2.url)).hash, "#fork");

  assert_equals((new URL(finalEntry3.url)).hash, "#spoon");

}, "navigate() during a same-document-navigation-initiated dispose works (since it's after the previous navigation)");

</script>