Mocking HttpClient in unit tests

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HttpClient’s extensibility lies in the HttpMessageHandler passed to the constructor. Its intent is to allow platform specific implementations, but you can also mock it. There’s no need to create a decorator wrapper for HttpClient.

If you’d prefer a DSL to using Moq, I have a library up on GitHub/Nuget that makes things a little easier: https://github.com/richardszalay/mockhttp

The Nuget Package RichardSzalay.MockHttp is available here.

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

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

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

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