nosetests.txt

$ nosetests -s test_foo.py
foo 140123586741304
.foo2 140123497640736
.
----------------------------------------------------------------------
Ran 2 tests in 0.000s

OK
del 140123586741304
del 140123497640736

pytest.txt

$ pytest -s testS_foo.py
============================= test session starts ==============================
platform linux -- Python 3.6.4, pytest-3.5.0, py-1.5.3, pluggy-0.6.0
rootdir: ***, inifile:
collected 2 items

test_foo.py foo 139935499752336
.del 139935499752336
foo2 139935499752336
.del 139935499752336


=========================== 2 passed in 0.01 seconds ===========================

test_foo.py

import unittest
class FooTest(unittest.TestCase):
    def __del__(self):
        print('del', id(self))
    def test_foo(self):
        print('foo', id(self))
    def test_foo2(self):
        print('foo2', id(self))