c# - xUnit and Moq do not support async - await keywords -

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i trying discover how apply async , await keywords xunit tests. using xunit 1.9 , async ctp 1.3. here test case

i have interface specifies 1 asynchronous method call

public interface idostuffasync {     task anasyncmethod(string value); }

i have class consumes interface , calls async method

public class useanasyncthing {     private readonly idostuffasync _dostuffasync;      public useanasyncthing(idostuffasync dostuffasync)     {         _dostuffasync = dostuffasync;     }      public async task dothatasyncoperation(string thevalue)     {         await _dostuffasync.anasyncmethod(thevalue);     } }

in tests wish check method dothatasyncoperation calling method correct value mock interface , use moq verify call

    [fact]     public async void the_test_will_pass_even_though_it_should_fail()     {         var mock = new mock<idostuffasync>();         var sut = new useanasyncthing(mock.object);          mock.setup(x => x.anasyncmethod(it.isany<string>()));          await sut.dothatasyncoperation("test");          // won't throw moq.mockexcpetion test appears pass         // not run         mock.verify(x => x.anasyncmethod("fail"));     }

this test using async , await keywords. when runs erroneously passes moq should assert verify fails. code after call sut.dothatasyncoperation("test"); not run

    [fact]     public void this_will_work_and_assert_the_reslt()     {         var mock = new mock<idostuffasync>();         var sut = new useanasyncthing(mock.object);          mock.setup(x => x.anasyncmethod(it.isany<string>()));          sut.dothatasyncoperation("test").continuewith(y => { });          // won't throw moq.mockexcpetion test appears pass         // not run         mock.verify(x => x.anasyncmethod("fail"));     }

this test setup without await , async keywords , passes fine.

is expected behavior xunit , moq?

update

thanks stephen's comment managed fix first test making 2 changes. test returns task instead of void , mock returns task.

    [fact]     public async task the_test_will_pass_even_though_it_should_fail()     {         var mock = new mock<idostuffasync>();         var sut = new useanasyncthing(mock.object);          mock.setup(x => x.anasyncmethod(it.isany<string>())).returnasync(true);          await sut.dothatasyncoperation("test");          // fails should         mock.verify(x => x.anasyncmethod("fail"));     }

change unit test method return task instead of void, , should work. support async void unit tests is being considered future release.

i describe in detail why async unit tests don't work default on blog. (my blog examples use mstest, same problems existed in every other test runner, including xunit pre-1.9).


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