Nunit async test exception assertion

Question

[Edit (May 2020)] - This issue has been reportedly addressed in newer releases of NUnit. Please see Nunit.ThrowsAsync. (Ref this answer, thanks @James-Ross)

Answer 1

I'm not sure when it was added, but the current version of Nunit (3.4.1 at time of writing) includes a ThrowsAsync method

see https://github.com/nunit/docs/wiki/Assert.ThrowsAsync

Example:

[Test]
public void ShouldThrow404WhenNotFound()
{
    var mockUserRepository = new Mock();
    mockUserRepository.Setup(x => x.GetByUserName(It.IsAny())).Returns(default(User));
    var userController = new UserController(mockUserRepository.Object) { Request = new HttpRequestMessage() };

    var exception = Assert.ThrowsAsync(() => userController.Get("foo"));

    Assert.That(exception.Response.StatusCode, Is.EqualTo(HttpStatusCode.NotFound));
}