Add unit tests covering JPetCommonTools class.
Add unit tests covering JPetCommonTools class.


Former-commit-id: 56379db8ac40ed53e0705f5435c546d31f20ff80
kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework,kmuzalewska/j-pet-framework