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test_quopri has a decorator that calls a test using both the C and
Python version of the tested function. This decorator looks like this:
def withpythonimplementation(testfunc):
 def newtest(self):
 # Test default implementation
 testfunc(self)
 # Test Python implementation
 if quopri.b2a_qp is not None or quopri.a2b_qp is not None:
 oldencode = quopri.b2a_qp
 olddecode = quopri.a2b_qp
 try:
 quopri.b2a_qp = None
 quopri.a2b_qp = None
 testfunc(self)
 finally:
 quopri.b2a_qp = oldencode
 quopri.a2b_qp = olddecode
 newtest.__name__ = testfunc.__name__
 return newtest
Adding such a decorator to every test method might solve the problem.