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WebKit export of https://bugs.webkit.org/show_bug.cgi?id=311298 #1

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WebKit export of https://bugs.webkit.org/show_bug.cgi?id=311298 #1

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62 changes: 62 additions & 0 deletions navigation-api/ordering-and-transition/navigate-intercept-microtask-depth.html
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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="variant" content="?no-currententrychange">
<meta name="variant" content="?currententrychange">

<script type="module">
import { Recorder, hasVariant } from "./resources/helpers.mjs";

// This test verifies that the "get a promise for waiting for all" algorithm
// (https://webidl.spec.whatwg.org/#dfn-get-a-promise-for-waiting-for-all)
// provides the correct microtask timing: navigatesuccess fires one microtask
// deeper than the handler promise reactions, not deferred to a separate task.
//
// A single-level Promise.resolve().then() microtask should fire BEFORE
// navigatesuccess, while a two-level chained microtask should fire AFTER it,
// since both navigatesuccess and the double microtask are at the same depth
// but navigatesuccess is queued first.

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

const from = navigation.currentEntry;

const recorder = new Recorder({
skipCurrentChange: !hasVariant("currententrychange"),
finalExpectedEvent: "transition.finished fulfilled"
});

recorder.setUpNavigationAPIListeners();

navigation.addEventListener("navigate", e => {
e.intercept({ handler() { recorder.record("handler run"); } });
});

const result = navigation.navigate("#1");
recorder.setUpResultListeners(result);

Promise.resolve().then(() => recorder.record("promise microtask"));
Promise.resolve().then(() => {
Promise.resolve().then(() => recorder.record("double promise microtask"));
});

await recorder.readyToAssert;

recorder.assert([
/* event name, location.hash value, navigation.transition properties */
["navigate", "", null],
["currententrychange", "#1", { from, navigationType: "push" }],
["handler run", "#1", { from, navigationType: "push" }],
["committed fulfilled", "#1", { from, navigationType: "push" }],
["transition.committed fulfilled", "#1", { from, navigationType: "push" }],
["promise microtask", "#1", { from, navigationType: "push" }],
["navigatesuccess", "#1", { from, navigationType: "push" }],
["double promise microtask", "#1", null],
["finished fulfilled", "#1", null],
["transition.finished fulfilled", "#1", null],
]);
}, "navigatesuccess fires at the correct microtask depth relative to handler promise reactions");
</script>
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