title: How can I check if project is a Test Project? (NUnit, MSTest, xUnit)
body: <p>I want to check if selected project (I have source code) is a TestProject for one of the following framework: NUnit, MSTest, xUnit.</p>
  
  <p>For MSTest it is simple. I can check .csproj and  tag. If I have there {3AC096D0-A1C2-E12C-1390-A8335801FDAB} than it means it is Test project.</p>
  
  <p>The problem are NUnit and xUnit. I can check for this cases references in .csproj. If I have nunit.framework or xunit it will be obvious. But I wondering if is possible to check this in diffrent way. </p>
  
  <p>Do you know different way to recognize test projects?</p>