web-platform-tests · jungkees · Mar 23, 2018 · Mar 23, 2018
diff --git a/service-workers/service-worker/postmessage-to-unloaded-client.https.html b/service-workers/service-worker/postmessage-to-unloaded-client.https.html
@@ -0,0 +1,56 @@
+<!doctype html>
+<title>Service Worker: postMessage to unloaded Client</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/test-helpers.sub.js"></script>
+<body>
+<script>
+promise_test(t => {
+  const url = 'resources/blank.html';
+  const script = 'resources/postmessage-to-unloaded-client-worker.js';
+  const scope = 'resources/';
+  let registration;
+  let unload_client;
+  return service_worker_unregister_and_register(t, script, scope)
+    .then(r => {
+        t.add_cleanup(() => { r.unregister(); });
+        registration = r;
+        return wait_for_state(t, r.installing, 'activated');
+      })
+    .then(() => {
+        return with_iframe(url);
+      })
+    .then(f => {
+        unload_client = f;
+        f.contentWindow.navigator.serviceWorker.onmessage = t.step_func(() => {
+          throw new Error('The client should have been unloaded.');
+        });
+        const promise =
+            new Promise(resolve => navigator.serviceWorker.onmessage = resolve);
+        registration.active.postMessage('syn');
+        return promise;
+      })
+    .then(e => {
+        if (e.data == 'ack') {
+          // Unload the client the service worker will post a message to.
+          unload_client.remove();
+          const promise = new Promise(
+              resolve => navigator.serviceWorker.onmessage = resolve);
+          registration.active.postMessage('post-back-to-unloaded-client');
+          t.step_timeout(() => {
+            throw new Error('postMessage to unloaded Client did not throw.');
+          }, 2000);
+          return promise;
+        }
+      })
+    .then(e => {
+        assert_equals(
+          e.data,
+          'InvalidStateError',
+          'postMessage to unloaded Client must throw an "InvalidStateError" ' +
+          'DOMException.');
+      })
+    .catch(unreached_rejection(t));
+}, 'postMessage from service worker to unloaded Client.');
+</script>
+</body>
diff --git a/service-workers/service-worker/resources/postmessage-to-unloaded-client-worker.js b/service-workers/service-worker/resources/postmessage-to-unloaded-client-worker.js
@@ -0,0 +1,28 @@
+let main_client, unload_client;
+let resolve;
+
+self.addEventListener('message', e => {
+  if (e.data == 'syn') {
+    clients.matchAll({includeUncontrolled: true}).then(clients => {
+      clients.forEach(client => {
+        if (client.url.indexOf('postmessage-to-unloaded-client') > -1) {
+          main_client = client;
+        } else if (client.url.indexOf('blank') > -1) {
+          unload_client = client;
+        }
+      });
+      e.waitUntil(new Promise(r => {
+        resolve = r;
+        main_client.postMessage('ack');
+      }));
+    });
+  } else if (e.data == 'post-back-to-unloaded-client') {
+    try {
+      // Must throw an "InvalidStateError" DOMException.
+      unload_client.postMessage('never-get-this');
+    } catch(e) {
+      main_client.postMessage(e.name);
+    }
+    resolve();
+  }
+});