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    <p>MSTest has an <code>ExpectedExceptionAttribute</code> that can be used, but it is a less than ideal way to test an exception has been thrown because it doesn't let you assert the specific call that should throw. If any method in the test method throws the expected exception type, then the test passes. This can be bad with commonly used exception types like <code>InvalidOperationException</code>. I use MSTest a lot and we have a <code>Throws</code> helper method for this in our own <code>AssertHelper</code> class (in C#). F# will let you put it into an <code>Assert</code> module so that it appears with all the other Assert methods in intellisense, which is pretty cool:</p> <pre><code>namespace FSharpTestSpike open System open Microsoft.VisualStudio.TestTools.UnitTesting module Assert = let Throws&lt;'a&gt; f = let mutable wasThrown = false try f() with | ex -&gt; Assert.AreEqual(ex.GetType(), typedefof&lt;'a&gt;, (sprintf "Actual Exception: %A" ex)); wasThrown &lt;- true Assert.IsTrue(wasThrown, "No exception thrown") [&lt;TestClass&gt;] type MyTestClass() = [&lt;TestMethod&gt;] member this.``Expects an exception and thrown``() = Assert.Throws&lt;InvalidOperationException&gt; (fun () -&gt; InvalidOperationException() |&gt; raise) [&lt;TestMethod&gt;] member this.``Expects an exception and not thrown``() = Assert.Throws&lt;InvalidOperationException&gt; (fun () -&gt; ()) [&lt;TestMethod&gt;] member this.``Expects an InvalidOperationException and a different one is thrown``() = Assert.Throws&lt;InvalidOperationException&gt; (fun () -&gt; Exception("BOOM!") |&gt; raise) </code></pre>
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    1. POFor unit tests written in F# with mstest in vs2012, how do I assert that an exception is raised?
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    1. USmike z
    1. USmike z
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    1. POFor unit tests written in F# with mstest in vs2012, how do I assert that an exception is raised?
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    1. COGood point about the `ExpectedException` attribute. But I would change the implementation of `Throws` so the stack traces of unexpected exceptions are not swallowed: http://pastebin.com/gefukSj6
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      1. USNikon the Third
    2. CO@NikontheThird good point. updated.
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