Question 1

How to mock HttpClient with MockHttp in C#?

Accepted Answer

Create a MockHttpMessageHandler instance, use When() or Expect() to define responses with matchers, then call ToHttpClient() to get a mocked client. This integrates seamlessly into tests without network calls, as shown in the basic usage example.

Question 2

MockHttp vs Moq for HTTP testing: which is better?

Accepted Answer

MockHttp is specialized for HttpClient mocking with a fluent API and request matching, while Moq is a general-purpose mocking framework. MockHttp is more straightforward for HTTP scenarios, but Moq offers broader object mocking if you need more than HTTP.

Question 3

How to verify a request was called exactly once in MockHttp?

Accepted Answer

Use Expect() to set up request expectations, then call VerifyNoOutstandingExpectation() at the end of your test. This ensures all expected requests were matched in order, as illustrated in the OAuth example.

Question 4

Can MockHttp simulate HTTP errors like 500 Internal Server Error?

Accepted Answer

Yes, use the Respond() method with an HttpStatusCode parameter, such as .Respond(HttpStatusCode.InternalServerError), to mock error responses for testing error handling in your application code.

Question 5

What's the difference between When and Expect in MockHttp?

Accepted Answer

When creates backend definitions that match multiple times in any order, while Expect sets request expectations that match once and in sequence. Expectations are checked first, making them ideal for verifying specific call orders, as explained in the README.

Question 6

How to handle unmatched requests in MockHttp?

Accepted Answer

Use the Fallback property to define behavior for unmatched requests, such as throwing an exception or passing to a real HttpClient, as shown in the Fallback section with examples like mockHttp.Fallback.Throw(new InvalidOperationException(...)).

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