Chaos Python
Add this into your functional tests and smoke it. import sys, random def chaos_trace(frame, event, arg): if event == 'line' and random.random() < 0.000001: raise MemoryError() return chaos_trace sys.settrace(chaos_trace) You will get some lovely random failures injected into your code. A great way to find bugs, and make sure your reasoning is sound in the face of CHAOS!