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POMoq test passes even when verifying both Times.Once() and Times.Never() on same method call
 

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    <p>I'm using <code>Xunit</code> to test the <code>Create</code> method on my <code>CarController</code> and I'm using <code>Moq</code> to mock my <code>CarRepository</code>.</p> <p>I'm then using <code>mockCarRepository.Verify(m =&gt; m.Create(It.IsAny&lt;Car&gt;()), Times.Once());</code> to check that the <code>Create</code> method on my repository is being called. However the test passes irrespective of whether I call it or not.</p> <p>Here is a complete example where I verify <code>both that Create is called once AND that it is called never</code>. My test passes when I would have expected it to fail.</p> <pre><code>using System; using Moq; using Xunit; namespace Test { public class CarTest { [Fact()] public async void CreateTest() { var mockCarRepository = new Mock&lt;CarRepository&gt;(); var carController = new CarController(mockCarRepository.Object); carController.Create(new Car { Make = "Aston Martin", Model = "DB5" }); mockCarRepository.Verify(m =&gt; m.Create(It.IsAny&lt;Car&gt;()), Times.Once()); mockCarRepository.Verify(m =&gt; m.Create(It.IsAny&lt;Car&gt;()), Times.Never()); } } public class CarController { private readonly CarRepository _repo; public CarController(CarRepository repo) { _repo = repo; } public void Create(Car car) { _repo.Create(car); } } public class Car { public virtual String Make { get; set; } public virtual String Model { get; set; } } public class CarRepository { public virtual void Create(Car car) { // DO SOMETHING } } } </code></pre> <p>When I debug the test, although it still passes, I notice that the following exception is thrown:</p> <pre><code>A first chance exception of type 'Moq.MockException' occurred in Moq.dll Additional information: Expected invocation on the mock should never have been performed, but was 1 times: m =&gt; m.Create(It.IsAny&lt;Car&gt;()) No setups configured. Performed invocations: CarRepository.Create(Test.Car) </code></pre> <p>The exception is expected as I am calling <code>Create</code> once and verifying <code>Times.Never()</code> but I would like my test to fail. What do I need to do to achieve this?</p> <p><strong>Update</strong> It turns out that the problem was that I'd marked my test as <code>async</code> - removing that causes it to pass. However the actual code I'm writing will call an <code>async</code> method, so my question is now, how can I verify methods are called when using asynchronous methods?</p>
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