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    <p>Hard to know what you are trying to test here, so I can't give you a 100% accurate sample. Your sample code seems to be missing quite a few details... I filled some of the missing bits in, but there are more questions.</p> <p>In any case, a method I use for waiting on events is a semaphore. I like to use AutoResetEvent for this in simple occasions like this.</p> <pre><code>public class Foo { private IService _service; public EventHandler CalculationComplete; public Foo(IService service) { _service = service; _service.DoCompleted += (o,e) =&gt; { Calculated = e.Result; if(CalculationComplete != null) { CalculationComplete(this, new EventArgs()); } }; } public int Calculated; public void CalculateAsync(int param) { _service.DoAsync(param); } } public interface IService { void DoAsync(int param); event EventHandler&lt;DoResultEventArgs&gt; DoCompleted; } public class DoResultEventArgs : EventArgs { public int Result { get; set; } } [TestMethod] public void CalculateAsync_CallsService_CalculatedIsPopulated() { //Arrange Mock&lt;IService&gt; sMock = new Mock&lt;IService&gt;(); sMock.Setup(s =&gt; s.DoAsync(It.IsAny&lt;int&gt;())) .Raises(s =&gt; s.DoCompleted += null, new DoResultEventArgs() { Result = 324 }); Foo foo = new Foo(sMock.Object); AutoResetEvent waitHandle = new AutoResetEvent(false); foo.CalculationComplete += (o,e) =&gt; waitHandle.Set(); //Act foo.CalculateAsync(12); waitHandle.WaitOne(); //Assert Assert.IsEqual(foo.Calculated, 324); } </code></pre> <p>Without more information, this is the best I can do. I hope it was what you were looking for.</p>
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    1. COvery helpful thanks!
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