[ServiceWorker] Tests for Clients.openWindow().

LayoutTests/http/tests/serviceworker/chromium/resources/sw-test-helpers.js

+// Test helper that is meant as a mini test framework to be used from a service
+// worker that runs some tests and send results back to its client.
+//
+// A simple usage of this framework would consist of calling initialize() to
+// setup then runNextTestOrQuit() in order to start running the methods defined
+// by TESTS. Then, tests can start sending messages back to the client using
+// postMessage().
+//
+// Example:
+// var TESTS = [
+//     function simpleTest() {
+//         self.postMessage('you will receive this first');
+//     },
+//     function secondTest() {
+//         self.postMessage('secondTest done!');
+//         runNextTestOrQuit();
+//     }
+// ];
+//
+// initialize().runNextTestOrQuit();
+//
+// In addition, there is a helper method meant to synthesized notificationclick
+// events sent to a service worker, see synthesizeNotificationClick.
+
+var client = null;
+var currentTest = -1;
+
+self.initialize = function() {
+    return self.clients.getAll().then(function(clients) {
+        client = clients[0];
+    });
+}
+
+self.postMessage = function(msg) {
+    client.postMessage(msg);
+}
+
+// Run the next test in TESTS if any. Otherwise sends a 'quit' message. and
+// stops.
+// In order for that call to succeed, the script MUST have a TESTS array
+// defined.
+self.runNextTestOrQuit = function() {
+    ++currentTest;
+    if (currentTest >= TESTS.length) {
+        client.postMessage('quit');
+        return;
+    }
+    TESTS[currentTest]();
+}
+
+// This method will use the |client| in order to synthesize a notificationclick
+// event. The client will then use the testRunner.
+// The returned promise will be resolved with the notificationclick event
+// object.
+self.synthesizeNotificationClick = function() {
+    var promise = new Promise(function(resolve) {
+        var title = "fake notification";
+        registration.showNotification(title).then(function() {
+            client.postMessage({type: 'click', title: title});
+        });
+
+        var handler = function(e) {
+            resolve(e);
+            e.notification.close();
+            self.removeEventListener('notificationclick', handler);
+        };
+
+        self.addEventListener('notificationclick', handler);
+    });
+
+    return promise;
+}