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Navigation API: test same-document back() in an iframe #62425

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Navigation API: test same-document back() in an iframe #62425

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64 changes: 64 additions & 0 deletions navigation-api/navigation-methods/return-value/back-same-document-in-iframe.html
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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<iframe id="i1" src="/common/blank.html"></iframe>
<iframe id="i2" src="/common/blank.html"></iframe>

<script>
// Same-document traversals initiated from an iframe take a different path
// through "apply the history step" than traversals initiated from the top-level
// traversable: the traverse navigate event fires later, after the ongoing
// navigation state has been set up. These tests check that the traversal still
// completes normally. See https://github.com/whatwg/html/issues/12832.

// Wait for after the load event so that the navigations don't get converted
// into replace navigations.
const afterLoad = new Promise(resolve => window.onload = () => setTimeout(resolve, 0));

promise_test(async t => {
await afterLoad;
const w = i1.contentWindow;

await w.navigation.navigate("#1").finished;
assert_equals(w.navigation.entries().length, 2);
const [entry0, entry1] = w.navigation.entries();
assert_equals(w.navigation.currentEntry, entry1);

let successCount = 0;
w.navigation.onnavigatesuccess = () => successCount++;
w.navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");

const result = w.navigation.back();
await assertBothFulfill(t, result, entry0, w);
assert_equals(w.navigation.currentEntry, entry0);
assert_equals(successCount, 1, "navigatesuccess must fire exactly once");
assert_equals(w.navigation.transition, null);
}, "same-document back() in an iframe: committed and finished fulfill, navigatesuccess fires");

promise_test(async t => {
await afterLoad;
const w = i2.contentWindow;

await w.navigation.navigate("#1").finished;
assert_equals(w.navigation.entries().length, 2);
const [entry0, entry1] = w.navigation.entries();
assert_equals(w.navigation.currentEntry, entry1);

let handlerCalled = false;
let successCount = 0;
w.navigation.onnavigate = t.step_func(e => {
assert_equals(e.navigationType, "traverse");
e.intercept({ handler: () => { handlerCalled = true; return Promise.resolve(); } });
});
w.navigation.onnavigatesuccess = () => successCount++;
w.navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");

const result = w.navigation.back();
await assertBothFulfill(t, result, entry0, w);
assert_true(handlerCalled, "intercept() handler must run");
assert_equals(w.navigation.currentEntry, entry0);
assert_equals(successCount, 1, "navigatesuccess must fire exactly once");
assert_equals(w.navigation.transition, null);
}, "same-document back() in an iframe with intercept(): handler runs, committed and finished fulfill, navigatesuccess fires");
</script>