如何使用反射实现或模拟Go接口？

Question

I want to implement Go interfaces with reflection to generate mocks and stubs. But if I look at the reflect package, I get no idea how to do it (maybe it is not possible).

Example: Testing that a func calls WriteHeader(404) on ResponseWriter:

type ResponseWriterMock struct {                              //
  status int                                                  //
}                                                             // How to replace
func (*ResponseWriterMock) Header() Header {}                 // this block with 
func (*ResponseWriterMock) Write([]byte) (i int, e error) {}  // a reflectivly 
func (m *ResponseWriterMock) WriteHeader(status int) {        // generated mock? 
  m.status = status                                           //  
}                                                             //
responseWriterMock := new(ResponseWriterMock)

funcToTest(responseWriterMock)

if responseWriterMock.status != 404 {
    // report error
}

With RhinoMocks (C#) I would write it like this:

var responseWriterMock = MockRepository.GenerateMock<ResponseWriter>();

funcToTest(responseWriterMock);

responseWriterMock.AssertWasCalled(rw => rw.WriteHeader(404));

How can I implement Go interfaces with reflection?

Addendum

Seems like it is not possible today.

Answer 1

To the best of my knowledge and the answers of this related question, it is not possible to create new types at runtime.

You may want to try the go-eval package which should support defining new types in it's universe.