[VideoPlayer] Browser tests for new separated video player app

chrome/browser/resources/video_player/js/test_util.js

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * Namespace for test related things.
+ */
+var test = test || {};
+
+/**
+ * Namespace for test utility functions.
+ *
+ * Public functions in the test.util.sync and the test.util.async namespaces are
+ * published to test cases and can be called by using callRemoteTestUtil. The
+ * arguments are serialized as JSON internally. If application ID is passed to
+ * callRemoteTestUtil, the content window of the application is added as the
+ * first argument. The functions in the test.util.async namespace are passed the
+ * callback function as the last argument.
+ */
+test.util = {};
+
+/**
+ * Namespace for synchronous utility functions.
+ */
+test.util.sync = {};
+
+/**
+ * Namespace for asynchronous utility functions.
+ */
+test.util.async = {};
+
+/**
+ * Extension ID of the testing extension.
+ * @type {string}
+ * @const
+ */
+test.util.TESTING_EXTENSION_ID = 'oobinhbdbiehknkpbpejbbpdbkdjmoco';
+
+/**
+ * Opens the main Files.app's window and waits until it is ready.
+ *
+ * @param {Window} contentWindow Video player window to be chacked toOB.
+ * @return {boolean} True if the video is playing, false otherwise.
+ */
+test.util.sync.isPlaying = function(contentWindow) {
+  var selector = 'video[src]';
+  var element = contentWindow.document.querySelector(selector);
+  if (!element)
+    return false;
+
+  return !element.paused;
+};
+
+/**
+ * Gets total Javascript error count from each app window.
+ * @return {number} Error count.
+ */
+test.util.sync.getErrorCount = function() {
+  var totalCount = JSErrorCount;
+  for (var appId in appWindowsForTest) {
+    var contentWindow = appWindowsForTest[appId].contentWindow;
+    if (contentWindow.JSErrorCount)
+      totalCount += contentWindow.JSErrorCount;
+  }
+
+  // Errors in the background page.
+  totalCount += window.JSErrorCount;
+
+  return totalCount;
+};
+
+/**
+ * Registers message listener, which runs test utility functions.
+ */
+test.util.registerRemoteTestUtils = function() {
+  // Register the message listener.
+  var onMessage = chrome.runtime ? chrome.runtime.onMessageExternal :
+      chrome.extension.onMessageExternal;
+  // Return true for asynchronous functions and false for synchronous.
+  onMessage.addListener(function(request, sender, sendResponse) {
+    // Check the sender.
+    if (sender.id != test.util.TESTING_EXTENSION_ID) {
+      console.error('The testing extension must be white-listed.');
+      sendResponse(false);
+      return false;
+    }
+    if (!request.func || request.func[request.func.length - 1] == '_') {
+      request.func = '';
+    }
+    // Prepare arguments.
+    var args = request.args.slice();  // shallow copy
+    if (request.file) {
+      if (!appWindowsForTest[request.file]) {
+        console.error('Specified window not found: ' + request.file);
+        sendResponse(false);
+        return false;
+      }
+      args.unshift(appWindowsForTest[request.file].contentWindow);
+    }
+    // Call the test utility function and respond the result.
+    if (test.util.async[request.func]) {
+      args[test.util.async[request.func].length - 1] = function() {
+        console.debug('Received the result of ' + request.func);
+        sendResponse.apply(null, arguments);
+      };
+      console.debug('Waiting for the result of ' + request.func);
+      test.util.async[request.func].apply(null, args);
+      return true;
+    } else if (test.util.sync[request.func]) {
+      sendResponse(test.util.sync[request.func].apply(null, args));
+      return false;
+    } else {
+      console.error('Invalid function name.');
+      sendResponse(false);
+      return false;
+    }
+  }.wrap());
+};
+
+// Register the test utils.
+test.util.registerRemoteTestUtils();