Interoperability with JUnit tests

[TheBigSasha]

Some users have had issues running this tester from a class which also contains JUnit tests.

[croissantfriend]

It actually seems okay if the tester is run from a class that also contains JUnit tests, in a package with no other classes that also contain JUnit tests. But if the tester is run as part of a package with classes that contain JUnit tests outside of the class the tester is called from, the application won't launch. Might need more testing to see precisely when the bug occurs though.