Add User Testing interface to impl/memory.

impl/dummy/dummy.go

 // Copyright 2015 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.
 
 package dummy
 
 import (
         "fmt"
         "runtime"
         "strings"
@@ skipping 156 matching lines @@
 
 type u struct{}
 
 func (u) Current() *user.User                              { panic(ni()) }
 func (u) CurrentOAuth(...string) (*user.User, error)       { panic(ni()) }
 func (u) IsAdmin() bool                                    { panic(ni()) }
 func (u) LoginURL(string) (string, error)                  { panic(ni()) }
 func (u) LoginURLFederated(string, string) (string, error) { panic(ni()) }
 func (u) LogoutURL(string) (string, error)                 { panic(ni()) }
 func (u) OAuthConsumerKey() (string, error)                { panic(ni()) }
+func (u) Testable() user.Testable                          { panic(ni()) }
 
 var dummyUserInst = u{}
 
 // User returns a dummy user.Interface implementation suitable for embedding.
 // Every method panics with a message containing the name of the method which
 // was unimplemented.
 func User() user.Interface { return dummyUserInst }