GitHub Action to run pytest

[cclauss]

Related to

• 2.5.0 + master (b68af1b0): pytest is failing #332

Some contributors care about pytest and others do not.

This GitHub Action allows contributors to see which tests pass and which ones fail.
They can use this visibility to propose fixes to reduce the 10 --ignored files. There are currently only 35 tests that fail.

pip install pytest testscenarios # Not updated since 2015

pytest --ignore=testtools/tests/matchers/test_basic.py \
       --ignore=testtools/tests/matchers/test_const.py \
       --ignore=testtools/tests/matchers/test_datastructures.py \
       --ignore=testtools/tests/matchers/test_dict.py \
       --ignore=testtools/tests/matchers/test_doctest.py \
       --ignore=testtools/tests/matchers/test_exception.py \
       --ignore=testtools/tests/matchers/test_higherorder.py \
       --ignore=testtools/tests/matchers/test_warnings.py \
       --ignore=testtools/tests/test_testcase.py \
       --ignore=testtools/tests/test_testresult.py .

============================= test session starts ==============================
platform linux -- Python 3.11.6, pytest-7.4.2, pluggy-1.3.0
rootdir: /home/runner/work/testtools/testtools
collected 308 items

testtools/tests/test_assert_that.py .............                        [  4%]
testtools/tests/test_compat.py .....................                     [ 11%]
testtools/tests/test_content.py ......................................   [ 23%]
testtools/tests/test_content_type.py .........                           [ 26%]
testtools/tests/test_distutilscmd.py ...                                 [ 27%]
testtools/tests/test_fixturesupport.py ........                          [ 29%]
testtools/tests/test_helpers.py ...                                      [ 30%]
testtools/tests/test_monkey.py ..............                            [ 35%]
testtools/tests/test_run.py .s..........                                 [ 39%]
testtools/tests/test_runtest.py ........................                 [ 47%]
testtools/tests/test_tags.py ..........                                  [ 50%]
testtools/tests/test_testsuite.py .................                      [ 55%]
testtools/tests/test_with_with.py ..........                             [ 59%]
testtools/tests/matchers/test_filesystem.py ............................ [ 68%]
                                                                         [ 68%]
testtools/tests/matchers/test_impl.py ...........                        [ 71%]
testtools/tests/twistedsupport/test_deferred.py sss.                     [ 73%]
testtools/tests/twistedsupport/test_matchers.py sssssssssssss.           [ 77%]
testtools/tests/twistedsupport/test_runtest.py sssssssssssssssssssssssss [ 85%]
ssssssssssssssss.                                                        [ 91%]
testtools/tests/twistedsupport/test_spinner.py sssssssssssssssssssssssss [ 99%]
s.                                                                       [100%]

================= 224 passed, 84 skipped, 27 warnings in 1.45s =================