Tweak Python sanity test

 - Move it out of the "unit" package, as it's not itself a unit test.

 - Suffix the test class with "Test" as we do with every other subclass
   of unittest.TestCase.

 - Add a larger-than-we'll-need-any-time-soon maxDiff so that failures
   are fully described.

 - Relax the assertion from assertListEqual to assertSequenceEqual
   since we don't actually care whether or not the sequences being
   compared are list instances.

 - Change the order of the assertions arguments to match the
   "<expected>, <actual>" convention used in our assert*Equal calls
   elsewhere throughout the test corpus.

 - Internal implementation simplifications.

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