title: Test Impact Analysis & Ms build execute only Impacted Test
body: <p>I have a TFS build in VS2010. Following the build unit tests are executed. 
  In the Build summary it tells me that "1 test run(s) completed - 100% average pass rate" but below this it states "No tests were impacted". </p>
  
  <p>I guess Impacted Tests relate to functionality providing the ability to only run tests that were impacted by code checked in? </p>
  
  <p>Or is there a way that i can run only tests which where impacted based on result of Test Impact Analysis.</p>
  
  <p>I have  Set "Analyze Test Impact" to True but still no result coming and its executing all test cases in test projects.</p>