This document defines the coverage for the pthread_join function:

Assertion	Tested?
1		YES
2		YES
3		YES
4		NO ** Skipping for now.
5		YES
6		YES ** When it specifies 'may' fail and not 'shall' fail,
		      it will always return PASS, but will return a
		      PASS and print out a warning if it fails.
NOTE: