How to mock httpclient using mockery

Question

I am trying to use Mockery to mock a Http client, but when I try to pass in the return value I get an error saying type http.Response is not an expression

Below is my interface and handler

type HTTPClient interface { Get(url string) (resp *http.Response, err error) } type Handler struct { httpClient HTTPClient }

Mockery generated a mock class which looks like the below

type HTTPClient struct { mock.Mock } // Get provides a mock function with given fields: url func (_m *HTTPClient) Get(url string) (*http.Response, error) { ret := _m.Called(url) var r0 *http.Response if rf, ok := ret.Get(0).(func(string) *http.Response); ok { r0 = rf(url) } else { if ret.Get(0) != nil { r0 = ret.Get(0).(*http.Response) } } var r1 error if rf, ok := ret.Get(1).(func(string) error); ok { r1 = rf(url) } else { r1 = ret.Error(1) } return r0, r1 }

In my test, I am trying to mock the httpclient like below

httpClient := &mocks.HTTPClient{} httpClient.On("Get", request.SubscribeURL).Return(resp*http.Response, nil)

I am not sure what parameters I am supposed to in Return. What should I be passing?

Roman Kiselenko · Accepted Answer · 2020-01-25 09:11:48Z

The http.Response (notice it is without square brackets, it denotes a type mostly) is an expression, while you should return actual response (a return value of the function), since a function returns two values *http.Response a pointer to http response struct and an error or nil.

body := ioutil.NopCloser(strings.NewReader("hello world")) httpRespose := &http.Response{Body: body, Status: "200 OK", StatusCode: 200} httpClient.On("Get", request.SubscribeURL) .Return( httpRespose, // http response with string in the body and the code 200 nil, // no error occured while response processed )

ioutil.NopCloser is Deprecated as of Go 1.16, this function simply calls io.NopCloser.

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