Reland "Unit test for sync online wallpaper"

chrome/test/data/chromeos/wallpaper_manager/unit_tests/api_mock.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.
+
+
+var TestConstants = {
+  wallpaperURL: 'https://test.com/test.jpg',
+  // A dummy string which is used to mock an image.
+  image: '*#*@#&'
+};
+
+// Mock a few chrome apis.
+var chrome = {
+  storage: {
+    local: {
+      get: function(key, callback) {
+        var items = {};
+        switch (key) {
+          case Constants.AccessLocalWallpaperInfoKey:
+            items[Constants.AccessLocalWallpaperInfoKey] = {
+              'url': 'dummy',
+              'layout': 'dummy',
+              'source': 'dummy'
+            };
+        }
+        callback(items);
+      },
+      set: function(items, callback) {
+      }
+    },
+    sync: {
+      get: function(key, callback) {
+      },
+      set: function(items, callback) {
+      }
+    },
+    onChanged: {
+      addListener: function(listener) {
+        this.dispatch = listener;
+      }
+    }
+  },
+  syncFileSystem: {
+    onFileStatusChanged: {
+      addListener: function(listener) {
+        this.dispatch = listener;
+      }
+    }
+  },
+  app: {
+    runtime: {
+      onLaunched: {
+        addListener: function(listener) {
+        }
+      }
+    }
+  },
+  alarms: {
+    onAlarm: {
+      addListener: function(listener) {
+      }
+    }
+  },
+  wallpaperPrivate: {
+    getStrings: function(callback) {
+      callback({isExperimental: false});
+    }
+  }
+};
+
+(function (exports) {
+  var originalXMLHttpRequest = window.XMLHttpRequest;
+
+  // Mock XMLHttpRequest. It dispatches a 'load' event immediately with status
+  // equals to 200 in function |send|.
+  function MockXMLHttpRequest() {
+  }
+
+  MockXMLHttpRequest.prototype = {
+    responseType: null,
+    url: null,
+
+    send: function(data) {
+      this.status = 200;
+      this.dispatchEvent('load');
+    },
+
+    addEventListener: function(type, listener) {
+      this.eventListeners = this.eventListeners || {};
+      this.eventListeners[type] = this.eventListeners[type] || [];
+      this.eventListeners[type].push(listener);
+    },
+
+    removeEventListener: function (type, listener) {
+      var listeners = this.eventListeners && this.eventListeners[type] || [];
+
+      for (var i = 0; i < listeners.length; ++i) {
+        if (listeners[i] == listener) {
+          return listeners.splice(i, 1);
+        }
+      }
+    },
+
+    dispatchEvent: function(type) {
+      var listeners = this.eventListeners && this.eventListeners[type] || [];
+
+      if (/test.jpg$/g.test(this.url)) {
+        this.response = TestConstants.image;
+      } else {
+        this.response = '';
+      }
+
+      for (var i = 0; i < listeners.length; ++i)
+        listeners[i].call(this, new Event(type));
+    },
+
+    open: function(method, url, async) {
+      this.url = url;
+    }
+  };
+
+  function installMockXMLHttpRequest() {
+    window['XMLHttpRequest'] = MockXMLHttpRequest;
+  };
+
+  function uninstallMockXMLHttpRequest() {
+    window['XMLHttpRequest'] = originalXMLHttpRequest;
+  };
+
+  exports.installMockXMLHttpRequest = installMockXMLHttpRequest;
+  exports.uninstallMockXMLHttpRequest = uninstallMockXMLHttpRequest;
+
+})(window);