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chromium/third_party/blink/web_tests/external/wpt/navigation-api/navigation-methods/return-value/navigate-intercept-interrupted.html 

<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.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));

  navigation.addEventListener("navigate", e => e.intercept());

  const result1 = navigation.navigate("#1");
  const result2 = navigation.navigate("#2");

  assert_equals(navigation.entries().length, start_length + 2);
  assert_array_equals(navigation.entries().slice(start_index).map(e => (new URL(e.url)).hash), ["", "#1", "#2"]);

  await assertCommittedFulfillsFinishedRejectsDOM(t, result1, navigation.entries()[start_index + 1], "AbortError");
  await assertBothFulfill(t, result2, navigation.currentEntry);
}, "interrupted navigate() promises with intercept()");
</script>