The biz.aQute.junit jar placed itself
on the -runpath. This implied that the -runpath also contained the JUnit
libraries. This constrained the users (what JUnit to use) and it also
wreaked havoc in resolving. Therefore, this implementation places itself
on -runbundles instead and will import whatever version of JUnit the user
has installed into their system.

Unit tests for biz.aQute.tester live in the biz.aQute.tester.test project
under the test directory. Specifically, aQute.tester.test.ActivatorTest.
See also the readme in that project for tips about running the tests.