[issue1671298] Refactor test_class to use unittest lib

[Georg Brandl]

Georg Brandl added the comment:

I've figured out the problem with your call stack: the comparison of
callLst with the expected calls adds more calls to callLst, leading to a
failing comparison.

I've fixed this, but the new test still fails with regrtest -R:: -- will
investigate.

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<http://bugs.python.org/issue1671298>
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