use pytest-xdist to utilize multiple workers for Python tests

[firewave]

No description provided.

[firewave]

__________________________ test_color_tty[env0-True] ___________________________
[gw3] darwin -- Python 3.12.5 /usr/local/bin/python3

tmpdir = local('/private/var/folders/3p/1bg9mx4130dgqr_85c65ptwh0000gn/T/pytest-of-runner/pytest-1/popen-gw3/test_color_tty_env0_True_0')
env = {}, color_expected = True

    @pytest.mark.skipif(sys.platform == "win32", reason="TTY not supported in Windows")
    @pytest.mark.parametrize("env,color_expected", [({}, True), ({"NO_COLOR": "1"}, False)])
    def test_color_tty(tmpdir, env, color_expected):
        test_file = os.path.join(tmpdir, 'test.c')
        with open(test_file, 'wt') as f:
            f.write('#error test\nx=1;\n')
        exitcode, _, stderr = cppcheck([test_file], env=env, tty=True)
    
        assert exitcode == 0
>       assert stderr
E       AssertionError: assert ''

other_test.py:119: AssertionError
----------------------------- Captured stdout call -----------------------------
using '/Users/runner/work/cppcheck/cppcheck/cppcheck'
=========================== short test summary info ============================
FAILED other_test.py::test_color_tty[env0-True] - AssertionError: assert ''

I cannot reproduce this on Linux. I assume this might be because the used file is not unique but I cannot be sure. Needs some looking into.