app_shell: Extend identity API stub

extensions/shell/browser/api/identity/identity_api_unittest.cc

 // 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.
 
 #include "extensions/shell/browser/api/identity/identity_api.h"
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
@@ skipping 66 matching lines @@
 
   // Function succeeds and returns a token (for its callback).
   scoped_ptr<base::Value> result =
       RunFunctionAndReturnValue(new IdentityGetAuthTokenFunction, "[{}]");
   ASSERT_TRUE(result.get());
   std::string value;
   result->GetAsString(&value);
   EXPECT_EQ("token123", value);
 }
 
+// Verifies that the removeCachedAuthToken function exists and can be called
+// without crashing.
+TEST_F(IdentityApiTest, RemoveCachedAuthToken) {
+  MockShellOAuth2TokenService token_service;
+
+  // Function succeeds and returns nothing (for its callback).
+  scoped_ptr<base::Value> result = RunFunctionAndReturnValue(
+      new IdentityRemoveCachedAuthTokenFunction, "[{}]");
+  EXPECT_FALSE(result.get());
+}
+
 }  // namespace shell
 }  // namespace extensions