Not an issue,but a question:How to mock a interface and pass it by pointer? about gomock HOT 9 CLOSED

Your question doesn't make sense. The mock you create is a concrete type of the 
form *T, and *T implements the mocked interface. You are not passing a copy of 
the object when you use it as an interface value.

What do you mean?
I ran this command line to generate,and want to get a mock of 
http.ResponseWriter:
---------------------------------------------------------------
mockgen --source go/src/pkg/net/http/server.go -> 
/home/alex/IdeaProjects/AWS/src/activity/mock_server.go
---------------------------------------------------------------

Look in mock_server.go. There's a NewMockResponseWriter that returns
*MockResponseWriter, which satisfies the http.ResponseWriter
interface. You pass the *MockResponseWriter to the relevant
function/method.

I tried it,got an error:
cannot use responseWriterMock (type *MockResponseWriter) as type 
*http.ResponseWriter in function argument:
*http.ResponseWriter is pointer to interface, not interface

Yeah? It's telling you what you're doing wrong: your code should be
taking an http.ResponseWriter, not a pointer to it.

I come from java,so I can't make sure whether I have understood it 
correctly:during passing an interface,a copy will be made,and then all 
operations won't happened in the original but the copy,so verification will 
fail,right?:

func m_0(wr *http.ResponseWriter){
//here, a copy of wr will be passed into m_1,if change the signature of m_1 to
// m_1(wr http.ResponseWriter),all verification will fail,right?
     m_1(wr)
}

func m_1(wr *http.ResponseWriter){
    (*wr).Write(..)
}

I think you need to go learn about interfaces before trying to use
gomock. Perhaps start here:
http://golang.org/doc/effective_go.html#interfaces_and_types

I still can't solve this problem,would you please give a more detailed 
explanation?I want to verify wr.Write(..) do get invoked as following?

func m_0(wr *http.ResponseWriter){
     m_1(wr)
}

func m_1(wr *http.ResponseWriter){
    (*wr).Write(..)
}

Like I said back in #5, you should not be using pointers to interfaces.

This isn't GoMock specific. Please take further questions to the golang-nuts 
mailing list.