Question

I have an ASP.NET Web API application, with an ApiController that features asynchronous methods, returning Task<> objects and marked with the async keyword.

public class MyApiController : ApiController
{
    public async Task<MyData> GetDataById(string id)
    {
        ...
    }
}

How can I write NUnit tests for the ApiController’s asynchronous methods? If I need to use another testing framework I’m open for that too. I’m fairly new to .NET unit testing in general, so I’m interested in learning best practices.

Answer 1

It seems to me there is no support built into NUnit 2.6 for testing async methods returning Tasks. The best option I can see right now is to use Visual Studio’s own UnitTesting framework or xUnit.net as both support asynchronous tests.

With the Visual Studio UnitTesting framework I can write asynchronous tests like this:

using Microsoft.VisualStudio.TestTools.UnitTesting;

[TestClass]
public class TestAsyncMethods
{
    [TestMethod]
    public async Task TestGetBinBuildById()
    {
         ...
         var rslt = await obj.GetAsync();
         Assert.AreEqual(rslt, expected);
    }
}