$ ./python -m unittest -v Lib/distutils/tests/test_cmd.py 2>&1 | grep test_ensure_string_list
test_ensure_string_list (Lib.distutils.tests.test_cmd.CommandTestCase) ... ok
$

And after renaming the first test_ensure_string_list to
test_ensure_string_list_1 and the second one to
test_ensure_string_list_2:

$ ./python -m unittest -v Lib/distutils/tests/test_cmd.py 2>&1 | grep test_ensure_string_list
test_ensure_string_list_1 (Lib.distutils.tests.test_cmd.CommandTestCase) ... ok
test_ensure_string_list_2 (Lib.distutils.tests.test_cmd.CommandTestCase) ... ok
$