SpyServer for Go

Create simple, local test servers that records requests and responds with pre-configured results.

Why use this

Test code making http calls without having a slow, unreliable network in the way. Simplify testing when making calls to external services.

Go's httptest package is good, but this library gives you a few more benefits:

1. You don't need to point your tests to a different URL.
2. You can test that your client code closes the response body.
3. You can simulate various errors that may happen with the transport.

How to use

First, create a spyserver like this:

response := &http.Response{
    StatusCode: http.StatusOK,
    Body:       body,
}
err := fmt.Errorf("error")
spy := SpyServer{response, err}

Next, set the Transport in your http client to the spyserver and call it:

client := &http.Client{
    Transport: spy,
}
client.Do(request)

You can inspect the request sent to the server in your tests:

spy.GetRequest()

You can even test that you close the response body in your production code.

body := spyserver.NewCloseDetectorFromString(jsonString)

// Use the body the response you configure with your spy server
// Then just inject the spy server as usual and call your code

body.IsClosed() // returns true if you closed the response body