Question

正如理查德威利斯在http://blog.salamandersoft.co.uk/index.php/2009/10/how-to-mock-httpwebrequest-when-unit-testing/中建议的那样，我试图通过网络请求来缓解这种行为。

为此（我问我是否在这里乱搞一些东西）我实现了一个IWebRequestCreate并扩展了一个WebRequest和一个WebResponse。（链接代码中的更多细节）

但现在我的代码中有一个测试注册（WebRequest.RegisterPrefix）前缀：

[Test]
public void Test() {
     var some = File.ReadAllBytes(@"TestData\WebService\admrond_13jan2011_14jan2011.xml");
     WebRequest.RegisterPrefix("mockPrefix", new WebRequestCreateMock());
     WebRequestFake request = WebRequestCreateMock.CreateRequestFake(some);

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

然后，我收到了这个错误：Invalid URI: The hostname could not be parsed.

但为什么呢？在我PopulateWithMeterData(Meter meter)我有这个电话：

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

有什么建议吗？我的班级实施有趣吗？

编辑：@Matthew问：

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;
    }
}

网址类似于：mockPrefix://NoMatterUrl

Answer 1

由于错误是“无效的URI：无法解析主机名”。你可能搞砸了你的Uri“mockPrefix：// NoMatterUrl”

我遇到过这个问题，因为我忘记在域uri和请求参数之间添加“/”。

你能准确发布你的“NoMatterUri”的样子吗？

Answer 2

您需要使用冒号（'：'）注册您的前缀;如：

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

Answer 3

我发现必须在前缀中包含尾随的“/”。例如，“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 {}
}

使用.Net WebRequest Factory

3 个答案: