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test/fixtures/wpt/webmessaging/broadcastchannel/resources/service-worker.js

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+let promise_func = null;
+let promise = new Promise(resolve => promise_func = resolve);
+
+const SERVICE_WORKER_TEST_CHANNEL_NAME = 'service worker';
+const bc3 = new BroadcastChannel(SERVICE_WORKER_TEST_CHANNEL_NAME);
+bc3.onmessage = e => {
+  bc3.postMessage('done');
+  promise_func();
+};
+bc3.postMessage('from worker');
+
+// Ensure that the worker stays alive for the duration of the test
+self.addEventListener('install', evt => {
+  evt.waitUntil(promise);
+});