親クラスの setUp と tearDown を呼び出す TestCase クラス

nonvirtualunittes.py

import unittest

class TestCaseMeta(type):
    """Metaclass for TestCase class
    
    This metaclass make setUp method calls all setUp methods in base classes
    and then calls defined setUp method.  Likewise tearDown but in opposite
    order.
    """

    def __init__(cls, name, bases, ns):
        for method_name, reverse in [('setUp',False), ('tearDown', True)]:
            setattr(cls, method_name,
                    cls._create_method(method_name, bases, ns, reverse=False))
    
    @classmethod
    def _create_method(self, method_name, bases, ns, reverse=True):
        """return a method that calls all methods with given name in class
        hierarchy
        """
        # create method sequence in parent and current classes
        methods = [getattr(base, method_name, lambda self: None)
                   for base in bases]
        methods.append(ns.get(method_name, lambda self: None))
        # reverse order if necessary
        if reverse:
            methods.reverse()
        # define method to call all methods
        def call_methods(self):
            for method in methods:
                method(self)
        # return the caller method
        return call_methods

class TestCase(unittest.TestCase):
    __metaclass__ = TestCaseMeta