Last week I had a problem at a client where he ran a TFS build with tests and code coverage, but in the build summary report it only showed No Test Results and No Code Coverage Results. The strange thing is when I logged in and view the build, I could see the test results…
As you can guess, this problem is related to some missing security permissions. To be able to see test results you must have the View Test Runs permission, which can be assigned/revoked at the security group level per team project.
So setting this permission for the Contributors solved the problem.