JUnit report to show test functionality, not coverage

One of the problems of a team lead is that people on the team (sometimes even including myself) often create JUnit tests without any testing functionality.

It's easily done since the developers use their JUnit test as a harness to launch the part of the application they are coding, and then either deliberately or forgetfully just check it in without any assert tests or mock verifies.

Then later it gets forgotten that the tests are incomplete, yet they pass and produce great code coverage. Running up the application and feeding data through it will create high code coverage stats from Cobertura or Jacoco and yet nothing is tested except its ability to run without blowing up - and I've even seen that worked-around with big try-catch blocks in the test.

Is there a reporting tool out there which will test the tests, so that I don't need to review the test code so often?

I was temporarily excited to find http://ift.tt/1yuIm5a which tests the tests by changing the code under test (e.g. an if clause) and re-running it to see if it breaks the test.

However this isn't something you could set up to run on a CI server - it requires set-up on the command line, can't run without showing its GUI, only prints results onto the GUI and also takes ages to run.