Mocking HttpMessageHandler depending on the Request Url c#

Question

I have the following method to create a Http client with a mocked response:

public static HttpClient GetMockedHttpClient(string responseContent, HttpStatusCode httpStatusCode)
        {
            var handlerMock = new Mock<HttpMessageHandler>(MockBehavior.Strict);
            handlerMock
               .Protected()
               .Setup<Task<HttpResponseMessage>>(
                  "SendAsync",
                  ItExpr.IsAny<HttpRequestMessage>(),
                  ItExpr.IsAny<CancellationToken>()
               )
               .ReturnsAsync(new HttpResponseMessage()
               {
                   StatusCode = httpStatusCode,
                   Content = new StringContent(responseContent),
               })
               .Verifiable();
            return new HttpClient(handlerMock.Object);
        }

How can I make the response dependent on a specific url, so that the setup only takes effect when the HttpClient is called with a given address?

related: https://stackoverflow.com/questions/37051371/why-use-it-is-or-it-isany-if-i-could-just-define-a-variable (difference between `IsAny()` and `Is()`) — Andrew, Oct 15 '21 at 15:23

score 3 · Accepted Answer · answered Oct 15 '21 at 15:20

3

What you need to change is the line:

ItExpr.IsAny<HttpRequestMessage>(),

IsAny<HttpRequestMessage>() means the mock will catch any property of that type, if you want it to catch a specific uri you use Is<HttpRequestMessage>()

ItExpr.Is<HttpRequestMessage>(m => m.RequestUri == [your uri goes here]),

answered Oct 15 '21 at 15:20

Andrew

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1

that works thank you – DaveVentura Oct 15 '21 at 19:52

score 1 · Answer 2 · answered Oct 15 '21 at 15:20

1

I would suggest using https://github.com/justeat/httpclient-interception. I had to run similar tests and it did the job, although I used it to mock whole client.

answered Oct 15 '21 at 15:20

quain

861
5
18

thanks for the hint. I will have a look. – DaveVentura Oct 15 '21 at 20:00

Mocking HttpMessageHandler depending on the Request Url c#

2 Answers2