title: DirectoryInfo.Exists always returns false during MSTest
body: <p>I have a little bit of logic at the boundary of my app dealing with creating directories. I would like to test that it actually creates directories as expected, but the <a href="http://msdn.microsoft.com/en-us/library/system.io.directoryinfo.exists.aspx" rel="nofollow noreferrer">DirectoryInfo.Exists</a> property always returns false even when the directory actually exists.</p>
  
  <p>See also <a href="https://stackoverflow.com/questions/7254030/mstest-empty-directory-after-test-deleted">this question</a> - you need to set a breakpoint to see that the directory has actually been created because MSTest will delete it when the test ends.</p>
  
  <p>Is there some setting that tells MSTest to allow "normal" filesystem IO during tests?</p>