Seed test for SyncUI: sign in successfully with mocks.

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index 140efe7d4b5d9c1743d9ac1f96e095b6b39ba325..e5556d699435c5fd9f8cf35822c8c9ddd58b1672 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -110,6 +110,30 @@ var testing = {};
     testShouldFail: false,
 
     /**
+     * Create a new class to handle |messageNames|, assign it to
+     * |this.mockHandler|, register its messages and return it.
+     * @return {Mock} Mock handler class assigned to |this.mockHandler|.
+     */
+    makeAndRegisterMockHandler: function(messageNames) {
+      var MockClass = makeMockClass(messageNames);
+      this.mockHandler = mock(MockClass);
+      registerMockMessageCallbacks(this.mockHandler, MockClass);
+      return this.mockHandler;
+    },
+
+    /**
+     * Create a new class to handle |functionNames|, assign it to
+     * |this.mockGlobals|, register its global overrides, and return it.
+     * @return {Mock} Mock handler class assigned to |this.mockGlobals|.
+     */
+    makeAndRegisterMockGlobals: function(functionNames) {
+      var MockClass = makeMockClass(functionNames);
+      this.mockGlobals = mock(MockClass);
+      registerMockGlobals(this.mockGlobals, MockClass);
+      return this.mockGlobals;
+    },
+
+    /**
      * Override this method to perform initialization during preload (such as
      * creating mocks and registering handlers).
      * @type {Function}
@@ -388,6 +412,25 @@ var testing = {};
   }
 
   /**
+   * Empty function for use in making mocks.
+   * @const
+   */
+  function emptyFunction() {}
+
+  /**
+   * Make a mock from the supplied |methodNames| array.
+   * @param {Array.<string>} methodNames Array of names of methods to mock.
+   * @return {Function} Constructor with prototype filled in with methods
+   *     matching |methodNames|.
+   */
+  function makeMockClass(methodNames) {
+    function MockConstructor() {}
+    for(var i = 0; i < methodNames.length; i++)
+      MockConstructor.prototype[methodNames[i]] = emptyFunction;
+    return MockConstructor;
+  }
+
+  /**
    * Register all methods of {@code mockClass.prototype} as overrides to global
    * functions of the same name as the method, using the proxy of the
    * |mockObject| to handle the functions.