The {attribute 'call_after_init'} is not necessary for the test suites in the current implementation of TcUnit. Everything works without it - it was only necessary in the original implementation.
The FB_TestSuite function block has no methods that are call_after_init, and it extends no function blocks, thus it's just an unnecessary leftover.
The use of this attribute for test suites should be removed from the examples, documentation, and the verifier tests.
Fixed