forward-to-pruned-entry.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/navigation-methods/forward-to-pruned-entry.html - WPT Dashboard Interop Dashboard

<!doctype html>

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

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

<script>

promise_test(async t => {

  let start_length = navigation.entries().length;

  let start_index = navigation.currentEntry.index;

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

  // into a replace navigation.

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

  await navigation.navigate("#foo").finished;

  assert_equals(navigation.entries().length, start_length+1);

  await navigation.back().finished;

  assert_equals(navigation.currentEntry.index, start_index);

  // Traverse forward then immediately do a same-document push. This will

  // truncate the back forward list, and by the time the traverse commits, the

  // destination key will no longer be present in navigation.entries(). The

  // traverse should abort. Because the traverse aborts before the navigate

  // event fires, the navigateerror event should not fire.

  navigation.onnavigateerror = t.unreached_func("navigateerror should not fire");

  let forward_value = navigation.forward();

  await navigation.navigate("#clobber").finished;

  assert_equals(navigation.currentEntry.index, start_index+1);

  await promise_rejects_dom(t, "AbortError", forward_value.committed);

  await promise_rejects_dom(t, "AbortError", forward_value.finished);

  // This leaves navigation.entries() in a consistent state where traversing

  // back and forward still works.

  await navigation.back().finished;

  assert_equals(navigation.currentEntry.index, start_index);

  await navigation.forward().finished;

  assert_equals(navigation.currentEntry.index, start_index+1);

}, "If forward pruning clobbers the target of a traverse, abort");

</script>