Added checks to the testbench:  - Detect wrong callback calls  - Check decode return value
Added checks to the testbench:
 - Detect wrong callback calls
 - Check decode return value

Parrot-Developers/libARCommands,kradhub/libARCommands,Parrot-Developers/libARCommands,Parrot-Developers/libARCommands,kradhub/libARCommands,kradhub/libARCommands,kradhub/libARCommands