I'm studying the outyet example project from https://github.com/golang/example/tree/master/outyet. The test file does not cover the case where http.Head(url)
returns an error. I would like to extend the unit tests to cover the if statement where the error is logged (https://github.com/golang/example/blob/master/outyet/main.go#L100). I would like to mock http.Head()
, but I'm not sure how to do this. How can this be done?
如何模拟http.Head()
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- dousi1994 2015-05-23 15:06关注
The
http.Head
function simply calls theHead
method on the default HTTP client (exposed ashttp.DefaultClient
). By replacing the default client within your test, you can change the behaviour of these standard library functions.In particular, you will want a client that sets a custom transport (any object implementing the
http.RoundTripper
interface). Something like the following:type testTransport struct{} func (t testTransport) RoundTrip(request *http.Request) (*http.Response, error) { # Check expectations on request, and return an appropriate response } ... savedClient := http.DefaultClient http.DefaultClient = &http.Client{ Transport: testTransport{}, } # perform tests that call http.Head, http.Get, etc http.DefaultClient = savedClient
You could also use this technique to mock network errors by returning an error from your transport rather than an HTTP response.
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