Test cases are organized by systematic numbering:

<Category Letter><Number><Title>.<extension>

ie.

C0002.pml
C0020.py
G0030.pml

Categories
      
C : Automated command line tests
G : Automated graphical tests
T : Manual threading tests
U : Unix tests
B : PDB-based tests -- require a local copy of the PDB linked from ./pdb
L : Large datafile tests -- requires files too large to fit in distro.