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Mocking the HttpClient with NSubstitute

While reviewing some code I noticed that a project was using both Moq and NSubstitute. It seemed strange to me to use 2 mocking libraries in the same codebase.

Turned out that there was a problem when trying to combine IHttpClientFactory and NSubstitute. The reason is that the IHttpClientFactory returns a concrete type (HttpClient) and that NSubstitute cannot mock its methods (like SendAsync()).

The trick was to create your own HttpMessageHandler instead:

The mocking code became the following:

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