How to tell that a test case (TFS work item) had been tested?

I don't see in the test case work item status and reason anything to say "tested successfully"

• Design status is for when the test case is beeing written
• Ready status is for when the test case is ready to be tested
• Closed status has reasons saying the test case is "not to test" (deprecated, differed, dupplicated)

So how can we mark a test case as "sucessfully tested" ? It does not seem right that the tester does not have to attest that the case has been tested with success.