Simple wrapper to use for testing when you need a custom http.Client for faking network requests

mock_http_client.go

// https://golang.org/pkg/net/http/#Client

type MockClient struct {
	Body   interface{}
	DoFunc func(req *http.Request) (*http.Response, error)
}

func (m *MockClient) Do(req *http.Request) (*http.Response, error) {

	if m.DoFunc != nil {
		return m.DoFunc(req)
	}

	if m.Body != nil {
		body, err := json.Marshal(m.Body)
		if err != nil {
			return nil, err
		}

		return &http.Response{
			Body:       ioutil.NopCloser(bytes.NewBuffer(body)),
			StatusCode: http.StatusOK,
		}, nil
	}

	// Default response
	return &http.Response{}, nil
}