gistfile1.py

class Foo(object):
    def bar(value):
        if value == 11:
            raise ValueError()
        return value

    def hello(msg):
        return msg
    
class TestFoo_bar(TestCase):
    
    def _makeOne(self, *args, **kwargs):
        from foo import Foo
        return Foo(*args, **kwargs)
        
    def _callMUT(self, __one, *args, **kwargs):
        __one.bar(*args, **kwargs)
        
    def test_bar(self):
        test_value = 10
        foo = self._makeOne():
        self.assertEqual(self._callFUT(__one=foo, test_value), test_value)

    def test_bar_for_exception(self):
        test_value = 11
        foo = self._makeOne():
        self.assertRaises(ValueError, self._callMUT, foo, test_value)

class TestFoo_hello(TestCase):
    
    def _makeOne(self, *args, **kwargs):
        from foo import Foo
        return Foo(*args, **kwargs)
        
    def _callMUT(self, __one, *args, **kwargs):
        __one.hello(*args, **kwargs)
        
    def test_hello(self):
        test_msg = 'test_message'
        foo = self._makeOne():
        self.assertEqual(self._callMUT(__one=foo, test_msg), test_msg)