class_gen.py

from __future__ import print_function
from sys import modules


class Base(object):
    test_case = None
    @classmethod
    def __new__(cls, *args, **kwargs):
        cls.test_case = cls.__name__[-4:]
        return object.__new__(cls)

class BaseTest(Base):
    def test_something(self):
        assert self.test_case == self.__class__.__name__[-4:]

meta_class = BaseTest

for i in range(10000):
    clazz_name = "Test_{0:04d}".format(i)
    clazz = type(clazz_name, (meta_class,), dict())
    setattr(modules[meta_class.__module__], clazz.__name__, clazz)