(An issue similar to http://bugs.python.org/issue26911 , but with a different source file from the tests)

Lib/test/test_email/torture_test.py:15:from email.test.test_email import TestEmailBase

should be:

from test.test_email import TestEmailBase

because the first variant has a non-existing path.

(This makes the auto-requirements generator in ALT Sisyphus to generate a broken/unsatisfiable dependency on email.test.test_email when building the package from http://git.altlinux.org/people/imz/packages/python3.git .)

Similarly,

Lib/test/test_email/test_asian_codecs.py:8:from test.test_email.test_email import TestEmailBase

should better not have an extra "test_email" component in the path.

All other imports of test_email in Python 3.5.1 sources are of the form I'm suggesting:

$ git --no-pager grep -Fn .test_email
Lib/test/test_email/__init__.py:9:from test.test_email import __file__ as landmark
Lib/test/test_email/__main__.py:1:from test.test_email import load_tests
Lib/test/test_email/test__encoded_words.py:4:from test.test_email import TestEmailBase
Lib/test/test_email/test__header_value_parser.py:6:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_asian_codecs.py:8:from test.test_email.test_email import TestEmailBase
Lib/test/test_email/test_contentmanager.py:2:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_defect_handling.py:6:from test.test_email import TestEmailBase
Lib/test/test_email/test_email.py:42:from test.test_email import openfile, TestEmailBase
Lib/test/test_email/test_generator.py:8:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_headerregistry.py:8:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_inversion.py:11:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_message.py:5:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/test_parser.py:5:from test.test_email import TestEmailBase
Lib/test/test_email/test_pickleable.py:9:from test.test_email import TestEmailBase, parameterize
Lib/test/test_email/torture_test.py:15:from email.test.test_email import TestEmailBase
Misc/HISTORY:1733:- Issue #8315: (partial fix) python -m unittest test.test_email now works.

BTW, I'm not sure these two files are used anywhere, because grep gives no results for their names.