Tests failing on alpine linux

[a16bitsysop]

❓ I'm submitting a ...

• 🐞 bug report
• 🐣 feature request
• ❓ question about the decisions made in the repository

🐞 Describe the bug. What is the current behavior?

When pytest is run on alpine Linux there are 2 failures with cheroot 8.5.1

cheroot/test/test_conn.py::test_broken_connection_during_tcp_fin[RuntimeError(666)]
  /usr/lib/python3.8/site-packages/_pytest/threadexception.py:75: PytestUnhandledThreadExceptionWarning: Exception in thread CP Server Thread-24

  Traceback (most recent call last):
    File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
      self.run()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/workers/threadpool.py", line 130, in run
      conn.close()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/server.py", line 1360, in close
      self._close_kernel_socket()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/test/test_conn.py", line 655, in _close_kernel_socket
      old_close_kernel_socket(self)
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/server.py", line 1483, in _close_kernel_socket
      shutdown(socket.SHUT_RDWR)  # actually send a TCP FIN
    File "/usr/lib/python3.8/unittest/mock.py", line 1081, in __call__
      return self._mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1085, in _mock_call
      return self._execute_mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1146, in _execute_mock_call
      result = effect(*args, **kwargs)
    File "/usr/lib/python3.8/site-packages/pytest_mock/plugin.py", line 117, in wrapper
      r = method(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1081, in __call__
      return self._mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1085, in _mock_call
      return self._execute_mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1140, in _execute_mock_call
      raise effect
  RuntimeError: (666, 'Simulated socket error')

    warnings.warn(pytest.PytestUnhandledThreadExceptionWarning(msg))

And

cheroot/test/test_conn.py::test_broken_connection_during_tcp_fin[socket.error(-1)]
  /usr/lib/python3.8/site-packages/_pytest/threadexception.py:75: PytestUnhandledThreadExceptionWarning: Exception in thread CP Server Thread-25

  Traceback (most recent call last):
    File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
      self.run()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/workers/threadpool.py", line 130, in run
      conn.close()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/server.py", line 1360, in close
      self._close_kernel_socket()
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/test/test_conn.py", line 655, in _close_kernel_socket
      old_close_kernel_socket(self)
    File "/home/working/py3-cheroot/src/cheroot-8.5.1/cheroot/server.py", line 1483, in _close_kernel_socket
      shutdown(socket.SHUT_RDWR)  # actually send a TCP FIN
    File "/usr/lib/python3.8/unittest/mock.py", line 1081, in __call__
      return self._mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1085, in _mock_call
      return self._execute_mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1146, in _execute_mock_call
      result = effect(*args, **kwargs)
    File "/usr/lib/python3.8/site-packages/pytest_mock/plugin.py", line 117, in wrapper
      r = method(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1081, in __call__
      return self._mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1085, in _mock_call
      return self._execute_mock_call(*args, **kwargs)
    File "/usr/lib/python3.8/unittest/mock.py", line 1140, in _execute_mock_call
      raise effect
  OSError: [Errno -1] Simulated socket error

    warnings.warn(pytest.PytestUnhandledThreadExceptionWarning(msg))

❓ What is the motivation / use case for changing the behavior?
Tests need to pass to create a package

💡 To Reproduce

Steps to reproduce the behavior:

1. Try and build a package on alpine Linux
2. Tests fail

💡 Expected behavior

Tests pass, xfail, or skip
📋 Details

📋 Environment

• Cheroot version: 8.5.1
• CherryPy version: X.X.X (if applicable)
• Python version: 3.8.7
• OS: alpine:edge
• Browser: NA

📋 Additional context

[webknjaz]

As a workaround, either use pytest below 6.2.0 or disable the new plugins that cause these warnings. See the changelog for pytest v6.2.0 for more details.

[webknjaz]

Duplicate of #355

[a16bitsysop]

Okay thanks, to get the tests to pass I remove error from pytest.ini

filterwarnings =
-    error

And use:

pytest -W ignore::DeprecationWarning \
                --deselect=cheroot/test/test_ssl.py::test_tls_client_auth