Test structure

[Patricia Shanahan]

I'm looking for documentation, guidance, or even a good example for 
River test construction.

My tests only need one JVM - although I'll use multiple threads to set 
up concurrency stress for e.g. TaskManager. It looks as though some of 
the existing qa classes might be useful, and I don't like duplicating 
code, but I'm not sure how to use them.

Patricia