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To clarify:  It would be wrong to put in checks that refuse 
to run an invalid test that would have run today.

But wrapping TestCase in a TestSuite before returning it is 
probably OK, since it fixes the list(x) bug you mentioned; 
you just need to be sure that it won't break something 
else.  Unfortunately, it might.  (Is there something they 
could do to the TestCase() that would start to fail if you 
wrap it in a TestSuite()?  Remember that they might have 
local standards saying "only one test class per file" or 
something, so they might never have gotten a real suite 
back in the past.)