nosetests --with-isolations

isolation.py

# nosetests --with-isolation isolation.py

class T1(unittest.TestCase):
    def a_test_set_global_val(self):
        import math
        math.abbb = 12
        self.assertTrue(math.abbb == 12)

    def b_test_get_global_val_in_same_testcase(self):
        import math
        self.assertFalse(hasattr(math, 'abbb'))  # fails, AssertionError :(


class T2(unittest.TestCase):
    def a_test_get_global_val_in_other_testcase(self):
        import math
        self.assertFalse(hasattr(math, 'abbb'))  # fails, AssertionError :(