unit testing - How to mock http.Client Do method -

i'm trying find solution write test , mock http response. in function accept interface:

type httpclient interface {     do(req *http.request) (*http.response, error) } 

i makes http request base auth

func getoverview(client httpclient, overview *overview) (*overview, error) {      request, err := http.newrequest("get", fmt.sprintf("%s:%s/api/overview", overview.config.url, overview.config.port), nil)     if (err != nil) {         log.println(err)     }     request.setbasicauth(overview.config.user, overview.config.password)     resp, err := client.do(request) 

how can mock httpclient? i'm looking mock library, instance: https://github.com/h2non/gock there mock , post

maybe should in different way. i'll grateful advice

any struct method matching signature have in interface implement interface. example, create struct clientmock

type clientmock struct { } 

with method

func (c *clientmock) do(req *http.request) (*http.response, error) {     return &http.response{}, nil } 

you inject clientmock struct getoverview func. here's example in go playground.