Is it possible to mock out a .NET HttpWebResponse?

Question

i\'ve got an integration test that grabs some json result from a 3rd party server. It\'s really simple and works great.

I was hoping to stop actually hitting this se

Answer 1

I Found a great solution in this blog post:

It´s very easy to use, you just need to do this:

string response = "my response string here";
WebRequest.RegisterPrefix("test", new TestWebRequestCreate());
TestWebRequest request = TestWebRequestCreate.CreateTestRequest(response);

And copy those files to your project:

    class TestWebRequestCreate : IWebRequestCreate
{
    static WebRequest nextRequest;
    static object lockObject = new object();

    static public WebRequest NextRequest
    {
        get { return nextRequest ;}
        set
        {
            lock (lockObject)
            {
                nextRequest = value;
            }
        }
    }

    /// 
See .
    public WebRequest Create(Uri uri)
    {
        return nextRequest;
    }

    /// 
Utility method for creating a TestWebRequest and setting
    /// it to be the next WebRequest to use.
    /// The response the TestWebRequest will return.
    public static TestWebRequest CreateTestRequest(string response)
    {
        TestWebRequest request = new TestWebRequest(response);
        NextRequest = request;
        return request;
    }
}

class TestWebRequest : 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; }

    /// 
Initializes a new instance of 
    /// with the response to return.
    public TestWebRequest(string response)
    {
        responseStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(response));
    }

    /// 
Returns the request contents as a string.
    public string ContentAsString()
    {
        return System.Text.Encoding.UTF8.GetString(requestStream.ToArray());
    }

    /// 
See .
    public override Stream GetRequestStream()
    {
        return requestStream;
    }

    /// 
See .
    public override WebResponse GetResponse()
    {
        return new TestWebReponse(responseStream);
    }
}

class TestWebReponse : WebResponse
{
    Stream responseStream;

    /// 
Initializes a new instance of 
    /// with the response stream to return.
    public TestWebReponse(Stream responseStream)
    {
        this.responseStream = responseStream;
    }

    /// 
See .
    public override Stream GetResponseStream()
    {
        return responseStream;
    }
}