I have a test like this:
@Test(expected = RuntimeException.class)
public void somethingThrows()

{ something(); }

In a subclass, I override the test without expecting an exception.
@Override
@Test
public void somethingThrows(){ something(); }

The test in the subclass should only fail if it DOES throw, but when Clover runs, it reports this as a failed test because it does not throw a RuntimeException.