TV3 to TV3 migration tests can sometimes fail, as they don't find the right tracker by its ID. Instead of migrating the tracker and then finding it back by its ID, we should change the structure of the test. In a single test case, we migrate the tracker, and then run all of the checks. Doing this will prevent interference by other tests and it can pave the way to running those tests in a single, rolled-back transaction (which is not the case).