Prerender2 WPT: Externalize Web Locks web platform test

Bug: 1253158 Change-Id: Ie53aea533e024833a895c1e17436bef03970c277 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3895237 Reviewed-by: Lingqi Chi <[email protected]> Commit-Queue: Julie Jeongeun Kim <[email protected]> Cr-Commit-Position: refs/heads/main@{#1047309}
web-platform-tests · Sep 15, 2022 · 4fce7b2 · 4fce7b2
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diff --git a/speculation-rules/prerender/resources/web-locks.html b/speculation-rules/prerender/resources/web-locks.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/speculation-rules/prerender/resources/utils.js"></script>
+<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
+<script>
+
+const params = new URLSearchParams(location.search);
+
+// The main test page (restriction-web-locks.html) loads the initiator page,
+// then the initiator page will prerender itself with the `prerendering`
+// parameter.
+const isPrerendering = params.has('prerendering');
+
+if (!isPrerendering) {
+  loadInitiatorPage();
+} else {
+  const prerenderEventCollector = new PrerenderEventCollector();
+  const promise = navigator.locks.request('prerender-test-lock', lock => {});
+  prerenderEventCollector.start(promise, 'navigator.locks.request');
+}
+
+</script>
diff --git a/speculation-rules/prerender/restriction-web-locks.https.html b/speculation-rules/prerender/restriction-web-locks.https.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<title>Access to the Web Locks API is deferred</title>
+<meta name="timeout" content="long">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+<script src="/speculation-rules/prerender/resources/utils.js"></script>
+<body>
+<script>
+
+setup(() => assertSpeculationRulesIsSupported());
+
+promise_test(async t => {
+  const uid = token();
+  const bc = new PrerenderChannel('test-channel', uid);
+
+  const gotMessage = new Promise(resolve => {
+    bc.addEventListener('message', e => {
+      resolve(e.data);
+    }, {
+      once: true
+    });
+  });
+  const url = `resources/web-locks.html?uid=${uid}`;
+  window.open(url, '_blank', 'noopener');
+
+  const result = await gotMessage;
+  const expected = [
+    {event: 'started waiting navigator.locks.request',  prerendering: true},
+    {event: 'prerendering change',                      prerendering: false},
+    {event: 'finished waiting navigator.locks.request', prerendering: false},
+  ];
+  assert_equals(result.length, expected.length);
+  for (let i = 0; i < result.length; i++) {
+    assert_equals(result[i].event, expected[i].event, `event[${i}]`);
+    assert_equals(result[i].prerendering, expected[i].prerendering,
+      `prerendering[${i}]`);
+  }
+  bc.close();
+
+  // Send a close signal to PrerenderEventCollector on the prerendered page.
+  new PrerenderChannel('close', uid).postMessage('');
+}, `the access to the Web Locks API should be deferred until the prerendered
+   page is activated`);
+
+</script>
+</body>