Using .Net WebRequest Factory

As Richard Willis suggests in http://blog.salamandersoft.co.uk/index.php/2009/10/how-to-mock-httpwebrequest-when-unit-testing/ i'm trying to call a web request moking the behavior.

For that (I asking me if I'm messing something here) I implemented an IWebRequestCreate and extended a WebRequest and a WebResponse. (more details in link codes)

But now in my code I had a test that register ( WebRequest.RegisterPrefix ) a prefix:

[Test]
public void Test() {
     var some = File.ReadAllBytes(@"TestDataWebServiceadmrond_13jan2011_14jan2011.xml");
     WebRequest.RegisterPrefix("mockPrefix", new WebRequestCreateMock());
     WebRequestFake request = WebRequestCreateMock.CreateRequestFake(some);

     _remoteRepository.PopulateWithMeterData(_meter);
     ... (error in line before)

Then, I got this error: Invalid URI: The hostname could not be parsed.

But why? In my PopulateWithMeterData(Meter meter) I have this call:

     WebRequest request = WebRequest.Create(urlListMeteringData);
     WebResponse ws = request.GetResponse();

Some suggestion? Is interesting post my class implementations?

---

EDIT: as @Matthew ask:

public class WebRequestCreateMock : IWebRequestCreate {

    static WebRequest _nextRequest;
    static readonly object LockObject = new object();

    static public WebRequest NextRequest {
        get { return _nextRequest; }
        set {
            lock (LockObject) {
                _nextRequest = value;
            }
        }
    }

    public WebRequest Create(Uri uri) {
        return _nextRequest;
    }

    public static WebRequestFake CreateRequestFake(byte[] xmlStream) {
        WebRequestFake webRequestFake = new WebRequestFake(xmlStream);
        NextRequest = webRequestFake;
        return webRequestFake;
    }

}

public class WebRequestFake : WebRequest {
    MemoryStream requestStream = new MemoryStream();
    MemoryStream responseStream;

    public override string Method { get; set; }
    public override string ContentType { get; set; }
    public override long ContentLength { get; set; }

    public WebRequestFake(byte[] response) {
        responseStream = new MemoryStream(response);
    }

    public override Stream GetRequestStream() {
        return requestStream;
    }

    public override WebResponse GetResponse() {
        return new WebReponseFake(responseStream);
    }
}

public class WebReponseFake : WebResponse {

    private readonly Stream _responseStream;

    public WebReponseFake(Stream responseStream) {
        _responseStream = responseStream;
    }

    public override Stream GetResponseStream() {
        return _responseStream;
    }
}

And the Url is something like: mockPrefix://NoMatterUrl

---

Since the error is "Invalid URI: The hostname could not be parsed." you are probably screwing up your Uri "mockPrefix://NoMatterUrl"

I had this problem once because I forgot to add a "/" between the domain uri and the request parameters.

Can you post exactly what your "NoMatterUri" looks like?

---

You need to register your prefix with a colon (':'); as in:

WebRequest.RegisterPrefix("mockPrefix:", new WebRequestCreateMock());

---

I have found that it's necessary to include a trailing "/" in the prefix. For instance, " test://localhost/ ":

[TestClass]
public class WebRequestTests
{
    [TestMethod]
    public void TestWebRequestCreate()
    {
        const string uriString = "test://localhost/foo/bar.baz?a=b&c=d";
        var webRequest = new MockWebRequestCreateAssertUrl(uriString);
        Assert.IsTrue(WebRequest.RegisterPrefix("test://localhost/", webRequest),
                      "Failed to register prefix");
        Assert.IsNotNull(WebRequest.Create(uriString));
    }

    public class MockWebRequestCreateAssertUrl : IWebRequestCreate
    {
        private readonly Uri _expectedUri;

        public MockWebRequestCreateAssertUrl(string uriString)
        {
            _expectedUri = new Uri(uriString);
        }

        public WebRequest Create(Uri uri)
        {
            Assert.AreEqual(_expectedUri, uri, "uri parameter is wrong");
            return new MockWebRequestAssertUrl();
        }
    }

    public class MockWebRequestAssertUrl : WebRequest {}
}

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