How to test a QThread with QT Unit Test?

I want to unit test a thread in my QT application, by checking that it emits the right SIGNALS when it receives a given set of SIGNALS.

I am executing my tests from main like this: (found here: What unit-testing framework should I use for Qt?)

TestClass1 test1;
QTest::qExec(&test1, argc, argv);

And my test look something like this:

void TestClass1::test_my_thread(){
      MyThread my_thread();
      my_thread.start();
      QTest::qWait(2000);
      my_thread.terminate();
}

Well, the idea is that I connect the threads slots to TestClass1, so I can send signals to it from my TestClass, and then use QSignalSpy to detect if the right signals are emitted from the thread. But allready when I try to create and run the thread it fails:

QFATAL : TestClass1::test_my_thread() Received signal 11
FAIL!  : TestClass1::test_my_thread() Received a fatal error.
   Loc: [Unknown file(0)]

Are my approach completly wrong? or what am I doing wrong?