Golang模拟-类型冲突问题

Question

I'm mocking out a DataStore and it's Get/Set functionality. The trouble I'm having is: cannot use s (type *MockStore) as type *datastore.Storage in argument to EventHandler

This is caused by my EventHandler function needing to be passed a *datastore.Storage as an argument type. I want to Test (http test) EvenHandler() using the MockStore I've created instead of the real datastore. I'm using the golang testify mock package.

Some Code Examples

type MockStore struct{
  mock.Mock
}

func (s *MockStore) Get() ... 

func EventHandler(w http.ResponseWriter, r *http.Request, bucket *datastore.Storage){
  //Does HTTP stuff and stores things in a data store
  // Need to mock out the data store get/sets
}

// Later in my Tests
ms := MockStore
EventHandler(w,r,ms)

Answer 1

A few things:

• Create an interface that will be implemented both by datastore.Storage and your mock store.
• Use the above interface as the argument type in EventHandler (not a pointer to the interface).
• Pass a pointer to your MockStore to EventHandler, as the Get method is defined for a pointer to the struct.

Your updated code should be something like the following:

type Store interface {
   Get() (interface{}, bool) // change as needed
   Set(interface{}) bool
}

type MockStore struct {
   mock.Mock
}

func (s *MockStore) Get() ... 

func EventHandler(w http.ResponseWriter, r *http.Request,bucket datastore.Storage){
   //Does HTTP stuff and stores things in a data store
   // Need to mock out the data store get/sets
}


// Later in my Tests
ms := &MockStore{}
EventHandler(w,r,ms)