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Good to hear the news on increasing the coverage.

In general, don't do tests that hardwire implementation 
details.  Test it if it is a documented variable,  exposed 
through __all__, is a key constact (like the magic numbers 
in random.py), or a variable that a module user is likely to 
be relying upon.  Otherwise, no -- it should be possible to 
improve an implementation without crashing the suite.

I'll try to review a few of these over the next few days.