blocks|key|4651740|text|您可能会看看Microsoft+Fakes，特别是Shims-section。使用它们，您可以修改HttpClient本身的行为。前提条件是，您使用的是VS+Premium或Ultimate。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4651741|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/hh549175.aspx#shims^0|P|5|6|F|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

You might take a look at <a href="http://msdn.microsoft.com/en-us/library/hh549175.aspx#shims" rel="nofollow">Microsoft Fakes</a>, especially at the <code>Shims</code>-section. With them, you're able to modify the behaviours of your HttpClient itself. Prerequisite is, that you're using VS Premium or Ultimate.

blocks|key|145219|text|您可以将核心HttpMessageHandler替换为假的。看起来像这样的东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|145220|public+class+FakeResponseHandler+:+DelegatingHandler
{
++++private+readonly+Dictionary<Uri,+HttpResponseMessage>+_FakeResponses+=+new+Dictionary<Uri,+HttpResponseMessage>();

++++public+void+AddFakeResponse(Uri+uri,+HttpResponseMessage+responseMessage)
++++{
++++++++_FakeResponses.Add(uri,+responseMessage);
++++}

++++protected+override+Task<HttpResponseMessage>+SendAsync(HttpRequestMessage+request,+System.Threading.CancellationToken+cancellationToken)
++++{
++++++++if+(_FakeResponses.ContainsKey(request.RequestUri))
++++++++{
++++++++++++return+Task.FromResult(_FakeResponses[request.RequestUri]);
++++++++}
++++++++else
++++++++{
++++++++++++return+Task.FromResult(new+HttpResponseMessage(HttpStatusCode.NotFound)+{+RequestMessage+=+request+});
++++++++}
++++}
}|code-block|syntax|javascript|145221|然后，您可以创建一个将使用假处理程序的客户端。|145222|var+fakeResponseHandler+=+new+FakeResponseHandler();
fakeResponseHandler.AddFakeResponse(new+Uri("http://example.org/test"),+new+HttpResponseMessage(HttpStatusCode.OK));

var+httpClient+=+new+HttpClient(fakeResponseHandler);

var+response1+=+await+httpClient.GetAsync("http://example.org/notthere");
var+response2+=+await+httpClient.GetAsync("http://example.org/test");

Assert.Equal(response1.StatusCode,HttpStatusCode.NotFound);
Assert.Equal(response2.StatusCode,+HttpStatusCode.OK);|145223|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can replace the core HttpMessageHandler with a fake one. Something that looks like this...
<pre><code>public class FakeResponseHandler : DelegatingHandler
{
 private readonly Dictionary&lt;Uri, HttpResponseMessage&gt; _FakeResponses = new Dictionary&lt;Uri, HttpResponseMessage&gt;();

 public void AddFakeResponse(Uri uri, HttpResponseMessage responseMessage)
 {
 _FakeResponses.Add(uri, responseMessage);
 }

 protected override Task&lt;HttpResponseMessage&gt; SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
 {
 if (_FakeResponses.ContainsKey(request.RequestUri))
 {
 return Task.FromResult(_FakeResponses[request.RequestUri]);
 }
 else
 {
 return Task.FromResult(new HttpResponseMessage(HttpStatusCode.NotFound) { RequestMessage = request });
 }
 }
}
</code></pre>
and then you can create a client that will use the fake handler.
<pre><code>var fakeResponseHandler = new FakeResponseHandler();
fakeResponseHandler.AddFakeResponse(new Uri(&quot;http://example.org/test&quot;), new HttpResponseMessage(HttpStatusCode.OK));

var httpClient = new HttpClient(fakeResponseHandler);

var response1 = await httpClient.GetAsync(&quot;http://example.org/notthere&quot;);
var response2 = await httpClient.GetAsync(&quot;http://example.org/test&quot;);

Assert.Equal(response1.StatusCode,HttpStatusCode.NotFound);
Assert.Equal(response2.StatusCode, HttpStatusCode.OK);
</code></pre>

blocks|key|145246|text|我知道这是一个古老的问题，但我在搜索这个话题时遇到了这个问题，并找到了一个非常好的解决方案，使测试HttpClient变得更容易。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|145247|它可以通过nuget获得：|145248|https://github.com/richardszalay/mockhttp|145249|PM>+Install-Package+RichardSzalay.MockHttp|code-block|syntax|javascript|145250|下面是对用法的快速了解：|145251|var+mockHttp+=+new+MockHttpMessageHandler();

//+Setup+a+respond+for+the+user+api+(including+a+wildcard+in+the+URL)
mockHttp.When("http://localost/api/user/*")
++++++++.Respond("application/json",+"{'name'+:+'Test+McGee'}");+//+Respond+with+JSON

//+Inject+the+handler+or+client+into+your+application+code
var+client+=+new+HttpClient(mockHttp);

var+response+=+await+client.GetAsync("http://localost/api/user/1234");
//+or+without+await:+var+response+=+client.GetAsync("http://localost/api/user/1234").Result;

var+json+=+await+response.Content.ReadAsStringAsync();

//+No+network+connection+required
Console.Write(json);+//+{'name'+:+'Test+McGee'}|145252|在github项目页面上有更多信息。希望这能对你有所帮助。|145253|entityMap|0|LINK|mutability|MUTABLE|url^0|1D|A|0|0|0|15|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|J|3|K|5|L|7|19|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1A|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|S|3|T|5|6|7|1C|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|I]]]]

I know that this is an old question but I stumbled with it during a search on this topic and found a very nice solution to make testing <code>HttpClient</code> easier.

It is available via nuget:

<a href="https://github.com/richardszalay/mockhttp" rel="noreferrer">https://github.com/richardszalay/mockhttp</a>

<pre><code>PM&gt; Install-Package RichardSzalay.MockHttp
</code></pre>

Here is a quick look on the usage:

<pre><code>var mockHttp = new MockHttpMessageHandler();

// Setup a respond for the user api (including a wildcard in the URL)
mockHttp.When("http://localost/api/user/*")
 .Respond("application/json", "{'name' : 'Test McGee'}"); // Respond with JSON

// Inject the handler or client into your application code
var client = new HttpClient(mockHttp);

var response = await client.GetAsync("http://localost/api/user/1234");
// or without await: var response = client.GetAsync("http://localost/api/user/1234").Result;

var json = await response.Content.ReadAsStringAsync();

// No network connection required
Console.Write(json); // {'name' : 'Test McGee'}
</code></pre>

More info on the github project page.
Hope this can be useful.

I have a service which uses <code>Microsoft.Net.Http</code> to retrieve some <code>Json</code> data. Great!

Of course, I don't want my unit test hitting the actual server (otherwise, that's an integration test).

Here's my service ctor (which uses dependency injection...)

<pre><code>public Foo(string name, HttpClient httpClient = null)
{
...
}
</code></pre>

I'm not sure how I can mock this with ... say .. <code>Moq</code> or <code>FakeItEasy</code>.

I want to make sure that when my service calls <code>GetAsync</code> or <code>PostAsync</code> .. then i can fake those calls.

Any suggestions how I can do that?

I'm -hoping- i don't need to make my own Wrapper .. cause that's crap :( Microsoft can't have made an oversight with this, right?

(yes, it's easy to make wrappers .. i've done them before ... but it's the point!)

How to pass in a mocked HttpClient in a .NET test?

我有一个使用Microsoft.Net.Http来检索一些Json数据的服务。太棒了！当然，我不希望我的单元测试命中实际的服务器(否则，这是一个集成测试)。下面是我的服务ctor (它使用依赖注入...)public Foo(string name, HttpClient httpClient = null){...}...

问如何在.NET测试中传入模拟的HttpClient？
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