ExpectedException on TestMethod Visual Studio 2010

Question

Today I upgraded my solution with all the underlying projects from VS2008 to VS2010. Everything went well except for my unit tests.

First of all only the web project

Answer 1

Make sure your reference to Microsoft.VisualStudio.QualityTools.UnitTestingFramework is Version 10.0.0.0.

If it is version 9.0.0.0 this problem will occur in Visual Studio 2010.

Hope this helps. If people still have this problem.

Answer 2

I've had the same issue, but finally managed to get it working. Not really sure how but here's a list of things I did between it not working to when it started working again.

• Converted the project being tested to .NET 4
• Turned off CodeCoverage
• Turned CodeCoverage back on again
• Did a RebuildAll on the test project

Not sure which bit fixed it though. Anyway, hope this helps!

Answer 3

I ended up changing my tests to this form to avoid the breaking. Not ideal:

  [TestMethod]
  public void Guid()
  {
     try
     {
        Guid g = new Guid("myguid'123'");
     } 
     catch( FormatException fe)
     {
        return;  // expected exception - pass
     }

     Assert.Fail(); // exception not thrown - fail
  }

Answer 4

Gerrie pointed me in the right direction:

• Press Ctrl-Alt-E
• Open the Common Language Runtime Excepions Node
• Click Add
• Type Microsoft.VisualStudio.TestTools.UnitTesting.AssertFailedException
• Make sure that both checkboxes are unchecked.

This will get rid of the break on failed Asserts, but the test will still break when you have set an ExpectedException.

I was the one that set the 100 bonus for this, so some upvotes would be appreciated ;-)

Answer 5

According to Microsoft, this is not a bug, it's "by design":

http://connect.microsoft.com/VisualStudio/feedback/details/511897/expectedexception-still-causes-debugging-to-break-with-exception-was-unhandled-by-user-code

Answer 6

A Microsoft support guy told me to use Ctrl-F5 (start without debugging) when running my unit tests, and that seems to work.

Another thing to try is to go to Tools|Options|Debugging and un-check the "Enable Just My Code" option.