How to unit test a method with HttpWebRequest/Response dependencies

Question

Been trying to unit test this method but can't figure out how to do it.

public bool ValidateCaptcha(string captchaResponse, string captchaChallenge, string hostip) { var strPrivateKey = _secConfiguration.CaptchaPrivateKey; var strParameters = "verify?privatekey=" + strPrivateKey + "&remoteip=" + hostip + "&challenge=" + captchaChallenge+ "&response=" + captchaResponse; var url = CaptchaUrl + strParameters; var request = CreateHttpWebRequest(url); request.Proxy.Credentials = CredentialCache.DefaultCredentials; request.Method = "POST"; request.ContentType = "text/html"; request.ContentLength = 0; var response = GetHttpWebResponse(request); var writer = response.GetResponseStream(); var reader = new StreamReader(writer); var responseFromServer = reader.ReadToEnd(); var serverResponse = responseFromServer.Split('\n'); return serverResponse[0] == "true"; } private HttpWebResponse GetHttpWebResponse(HttpWebRequest request) { return (HttpWebResponse) request.GetResponse(); } private HttpWebRequest CreateHttpWebRequest(string url) { return (HttpWebRequest) WebRequest.Create(url); }

I had planned to moq the dependencies and have a couple of wrap classes

public class WrapHttpWebRequest : IHttpWebRequest { private readonly HttpWebRequest _request; public WrapHttpWebRequest(HttpWebRequest request) { _request = request; } public string Method { get { return _request.Method; } set { _request.Method = value; } } public IHttpWebResponse GetResponse() { return new WrapHttpWebResponse((HttpWebResponse)_request.GetResponse()); } }

and

public class WrapHttpWebResponse : IHttpWebResponse { private WebResponse _response; public WrapHttpWebResponse(HttpWebResponse response) { _response = response; } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } private void Dispose(bool disposing) { if (disposing) { if (_response != null) { ((IDisposable)_response).Dispose(); _response = null; } } } public Stream GetResponseStream() { return _response.GetResponseStream(); } }

But can't find a way to inject them. Any ideas how can I do this? Thanks.

gembird · Accepted Answer · 2014-09-09 14:58:45Z

You could create testable version of your class under test. Make the method virtual and override it in the testable version.

protected virtual HttpWebRequest CreateHttpWebRequest(string url) { return (HttpWebRequest)WebRequest.Create(url); } public class TesableClassUnderTest : ClassUnderTest { public HttpWebRequest HttpWebRequestFake { get; set; } protected override HttpWebRequest CreateHttpWebRequest(string url) { if (HttpWebRequestFake != null) return HttpWebRequestFake; return base.CreateHttpWebRequest(url); } }

Then in test set the fake object to your own value:

[TestMethod] public void test() { TesableClassUnderTest cut = new TesableClassUnderTest(); cut.HttpWebRequestFake = CreateFakeHttpWebRequest(); cut.ValidateCaptcha(...) Assert... }

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