0.4: pytest warnings

I'm trying to package your module as an rpm package. So I'm using the typical build, install and test cycle used on building packages from non-root account.

• "setup.py build"
• "setup.py install --root </install/prefix>"
• "pytest with PYTHONPATH pointing to sitearch and sitelib inside </install/prefix>

May I ask for help because few units are failing:

+ PYTHONPATH=/home/tkloczko/rpmbuild/BUILDROOT/python-unittest2pytest-0.4-2.fc35.x86_64/usr/lib64/python3.8/site-packages:/home/tkloczko/rpmbuild/BUILDROOT/python-unittest2pytest-0.4-2.fc35.x86_64/usr/lib/python3.8/site-packages
+ /usr/bin/pytest -ra
=========================================================================== test session starts ============================================================================
platform linux -- Python 3.8.12, pytest-6.2.5, py-1.10.0, pluggy-0.13.1
benchmark: 3.4.1 (defaults: timer=time.perf_counter disable_gc=False min_rounds=5 min_time=0.000005 max_time=1.0 calibration_precision=10 warmup=False warmup_iterations=100000)
Using --randomly-seed=2538216899
rootdir: /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4
plugins: forked-1.3.0, shutil-1.7.0, virtualenv-1.7.0, expect-1.1.0, flake8-1.0.7, timeout-1.4.2, betamax-0.8.1, freezegun-0.4.2, aspectlib-1.5.2, toolbox-0.5, rerunfailures-9.1.1, requests-mock-1.9.3, cov-2.12.1, flaky-3.7.0, benchmark-3.4.1, xdist-2.3.0, pylama-7.7.1, datadir-1.3.1, regressions-2.2.0, cases-3.6.3, xprocess-0.18.1, black-0.3.12, anyio-3.3.0, asyncio-0.15.1, trio-0.7.0, subtests-0.5.0, isort-2.0.0, hypothesis-6.14.6, mock-3.6.1, profiling-1.7.0, randomly-3.8.0, Faker-8.12.1, nose2pytest-1.0.8, pyfakefs-4.5.1, tornado-0.8.1, twisted-1.13.3
collected 36 items

tests/test_all_fixes.py .................s..................                                                                                                         [100%]

============================================================================= warnings summary =============================================================================
tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNone]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNone_out.py:14: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 'abc' is None

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:5: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert abc is 'xxx'

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:8: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 123 is xxx+y

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:9: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 456 is (aaa and bbb)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:10: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 789 is (ccc or ddd)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:11: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 123 is (True if You else False)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:14: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 'abc' is 'def'

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIs]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIs_out.py:18: SyntaxWarning: "is" with a literal. Did you mean "=="?
    assert 123 is xxx+z, 'This is wrong!'

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:5: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert abc is not 'xxx'

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:8: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 123 is not xxx+y

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:9: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 456 is not (aaa and bbb)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:10: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 789 is not (ccc or ddd)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:11: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 123 is not (True if You else False)

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:14: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 'abc' is not 'def'

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNot]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNot_out.py:18: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 123 is not xxx+z, error_message

tests/test_all_fixes.py::test_check_fixture[self_assert-assertIsNotNone]
  /home/tkloczko/rpmbuild/BUILD/unittest2pytest-0.4/tests/fixtures/self_assert/assertIsNotNone_out.py:14: SyntaxWarning: "is not" with a literal. Did you mean "!="?
    assert 'def' is not None

-- Docs: https://docs.pytest.org/en/stable/warnings.html
========================================================================= short test summary info ==========================================================================
SKIPPED [1] tests/test_all_fixes.py:87: unittest does not have TestCase.assertItemsEqual
================================================================ 35 passed, 1 skipped, 16 warnings in 1.21s ================================================================
pytest-xprocess reminder::Be sure to terminate the started process by running 'pytest --xkill' if you have not explicitly done so in your fixture with 'xprocess.getinfo(<process_name>).terminate()'.

Start with tests/test_all_fixes.py and the warning-producing fixture files under tests/fixtures/self_assert/, especially the assertIs and assertIsNot outputs. Run the reported pytest command and compare those fixtures with the test expectations; the issue does not specify a desired completion criterion.