Test failures with Python 3.12 due to warnings (from pytest)

[mgorny]

While technically the "problem" is in pytest itself, I think it'd be better if the test suite would be more resilient to warnings that don't affect the result.

========================================================= test session starts =========================================================
platform linux -- Python 3.12.0b1, pytest-7.3.1, pluggy-1.0.0
cachedir: .tox/py312/.pytest_cache
rootdir: /tmp/pytest-forked
configfile: tox.ini
plugins: forked-1.6.1.dev4+gd9d05e2
collected 10 items                                                                                                                    

testing/test_boxed.py ...xx.                                                                                                    [ 60%]
testing/test_xfail_behavior.py .F.F                                                                                             [100%]

============================================================== FAILURES ===============================================================
______________________________________________________ test_xfail[strict xpass] _______________________________________________________

is_crashing = False, is_strict = True, testdir = <Testdir local('/tmp/pytest-of-mgorny/pytest-2/test_xfail1')>

    @pytest.mark.parametrize(
        ("is_crashing", "is_strict"),
        (
            pytest.param(True, True, id="strict xfail"),
            pytest.param(False, True, id="strict xpass"),
            pytest.param(True, False, id="non-strict xfail"),
            pytest.param(False, False, id="non-strict xpass"),
        ),
    )
    def test_xfail(is_crashing, is_strict, testdir):
        """Test xfail/xpass/strict permutations."""
        # pylint: disable=possibly-unused-variable
        sig_num = signal.SIGTERM.numerator
    
        test_func_body = (
            "os.kill(os.getpid(), signal.SIGTERM)" if is_crashing else "assert True"
        )
    
        if is_crashing:
            # marked xfailed and crashing, no matter strict or not
            expected_letter = "x"  # XFAILED
            expected_lowercase = "xfailed"
            expected_word = "XFAIL"
        elif is_strict:
            # strict and not failing as expected should cause failure
            expected_letter = "F"  # FAILED
            expected_lowercase = "failed"
            expected_word = FAILED_WORD
        elif not is_strict:
            # non-strict and not failing as expected should cause xpass
            expected_letter = "X"  # XPASS
            expected_lowercase = "xpassed"
            expected_word = "XPASS"
    
        session_start_title = "*==== test session starts ====*"
        loaded_pytest_plugins = "plugins: forked*"
        collected_tests_num = "collected 1 item"
        expected_progress = f"test_xfail.py {expected_letter!s}*"
        failures_title = "*==== FAILURES ====*"
        failures_test_name = "*____ test_function ____*"
        failures_test_reason = "[XPASS(strict)] The process gets terminated"
        short_test_summary_title = "*==== short test summary info ====*"
        short_test_summary = f"{expected_word!s} test_xfail.py::test_function"
        if expected_lowercase == "xpassed":
            # XPASS wouldn't have the crash message from
            # pytest-forked because the crash doesn't happen
            short_test_summary = " ".join(
                (
                    short_test_summary,
                    "The process gets terminated",
                )
            )
        reason_string = (
            f"reason: The process gets terminated; "
            f"pytest-forked reason: "
            f"*:*: running the test CRASHED with signal {sig_num:d}"
        )
        if expected_lowercase == "xfailed" and PYTEST_GTE_7_2:
            short_test_summary += " - " + reason_string
        total_summary_line = f"*==== 1 {expected_lowercase!s} in 0.*s* ====*"
    
        expected_lines = (
            session_start_title,
            loaded_pytest_plugins,
            collected_tests_num,
            expected_progress,
        )
        if expected_word == FAILED_WORD:
            # XPASS(strict)
            expected_lines += (
                failures_title,
                failures_test_name,
                failures_test_reason,
            )
        expected_lines += (
            short_test_summary_title,
            short_test_summary,
        )
        if expected_lowercase == "xpassed" and expected_word == FAILED_WORD:
            # XPASS(strict)
            expected_lines += ("  " + reason_string,)
        expected_lines += (total_summary_line,)
    
        test_module = testdir.makepyfile(
            f"""
            import os
            import signal
    
            import pytest
    
            # The current implementation emits RuntimeWarning.
            pytestmark = pytest.mark.filterwarnings('ignore:pytest-forked xfail')
    
            @pytest.mark.xfail(
                reason='The process gets terminated',
                strict={is_strict!s},
            )
            @pytest.mark.forked
            def test_function():
                {test_func_body!s}
            """
        )
    
        pytest_run_result = testdir.runpytest(test_module, "-ra")
>       pytest_run_result.stdout.fnmatch_lines(expected_lines)
E       Failed: fnmatch: '*==== test session starts ====*'
E          with: '========================================================= test session starts ========================================================='
E       nomatch: 'plugins: forked*'
E           and: 'platform linux -- Python 3.12.0b1, pytest-7.3.1, pluggy-1.0.0'
E           and: 'rootdir: /tmp/pytest-of-mgorny/pytest-2/test_xfail1'
E       fnmatch: 'plugins: forked*'
E          with: 'plugins: forked-1.6.1.dev4+gd9d05e2'
E       exact match: 'collected 1 item'
E       nomatch: 'test_xfail.py F*'
E           and: ''
E       fnmatch: 'test_xfail.py F*'
E          with: 'test_xfail.py F                                                                                                                 [100%]'
E       nomatch: '*==== FAILURES ====*'
E           and: ''
E       fnmatch: '*==== FAILURES ====*'
E          with: '============================================================== FAILURES ==============================================================='
E       fnmatch: '*____ test_function ____*'
E          with: '____________________________________________________________ test_function ____________________________________________________________'
E       exact match: '[XPASS(strict)] The process gets terminated'
E       nomatch: '*==== short test summary info ====*'
E           and: '========================================================== warnings summary ==========================================================='
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    assertmsg = ast.Str("")'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    keys = [ast.Str(key) for key in current.keys()]'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941: DeprecationWarning: ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    clear = ast.Assign(variables, ast.NameConstant(None))'
E           and: ''
E           and: '-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html'
E       fnmatch: '*==== short test summary info ====*'
E          with: '======================================================= short test summary info ======================================================='
E       exact match: 'FAILED test_xfail.py::test_function'
E       nomatch: '*==== 1 failed in 0.*s* ====*'
E           and: '==================================================== 1 failed, 4 warnings in 0.01s ===================================================='
E       remains unmatched: '*==== 1 failed in 0.*s* ====*'

/tmp/pytest-forked/testing/test_xfail_behavior.py:121: Failed
-------------------------------------------------------- Captured stdout call ---------------------------------------------------------
========================================================= test session starts =========================================================
platform linux -- Python 3.12.0b1, pytest-7.3.1, pluggy-1.0.0
rootdir: /tmp/pytest-of-mgorny/pytest-2/test_xfail1
plugins: forked-1.6.1.dev4+gd9d05e2
collected 1 item

test_xfail.py F                                                                                                                 [100%]

============================================================== FAILURES ===============================================================
____________________________________________________________ test_function ____________________________________________________________
[XPASS(strict)] The process gets terminated
========================================================== warnings summary ===========================================================
../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    assertmsg = ast.Str("")

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    keys = [ast.Str(key) for key in current.keys()]

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941: DeprecationWarning: ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead
    clear = ast.Assign(variables, ast.NameConstant(None))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================================================= short test summary info =======================================================
FAILED test_xfail.py::test_function
==================================================== 1 failed, 4 warnings in 0.01s ====================================================
____________________________________________________ test_xfail[non-strict xpass] _____________________________________________________

is_crashing = False, is_strict = False, testdir = <Testdir local('/tmp/pytest-of-mgorny/pytest-2/test_xfail3')>

    @pytest.mark.parametrize(
        ("is_crashing", "is_strict"),
        (
            pytest.param(True, True, id="strict xfail"),
            pytest.param(False, True, id="strict xpass"),
            pytest.param(True, False, id="non-strict xfail"),
            pytest.param(False, False, id="non-strict xpass"),
        ),
    )
    def test_xfail(is_crashing, is_strict, testdir):
        """Test xfail/xpass/strict permutations."""
        # pylint: disable=possibly-unused-variable
        sig_num = signal.SIGTERM.numerator
    
        test_func_body = (
            "os.kill(os.getpid(), signal.SIGTERM)" if is_crashing else "assert True"
        )
    
        if is_crashing:
            # marked xfailed and crashing, no matter strict or not
            expected_letter = "x"  # XFAILED
            expected_lowercase = "xfailed"
            expected_word = "XFAIL"
        elif is_strict:
            # strict and not failing as expected should cause failure
            expected_letter = "F"  # FAILED
            expected_lowercase = "failed"
            expected_word = FAILED_WORD
        elif not is_strict:
            # non-strict and not failing as expected should cause xpass
            expected_letter = "X"  # XPASS
            expected_lowercase = "xpassed"
            expected_word = "XPASS"
    
        session_start_title = "*==== test session starts ====*"
        loaded_pytest_plugins = "plugins: forked*"
        collected_tests_num = "collected 1 item"
        expected_progress = f"test_xfail.py {expected_letter!s}*"
        failures_title = "*==== FAILURES ====*"
        failures_test_name = "*____ test_function ____*"
        failures_test_reason = "[XPASS(strict)] The process gets terminated"
        short_test_summary_title = "*==== short test summary info ====*"
        short_test_summary = f"{expected_word!s} test_xfail.py::test_function"
        if expected_lowercase == "xpassed":
            # XPASS wouldn't have the crash message from
            # pytest-forked because the crash doesn't happen
            short_test_summary = " ".join(
                (
                    short_test_summary,
                    "The process gets terminated",
                )
            )
        reason_string = (
            f"reason: The process gets terminated; "
            f"pytest-forked reason: "
            f"*:*: running the test CRASHED with signal {sig_num:d}"
        )
        if expected_lowercase == "xfailed" and PYTEST_GTE_7_2:
            short_test_summary += " - " + reason_string
        total_summary_line = f"*==== 1 {expected_lowercase!s} in 0.*s* ====*"
    
        expected_lines = (
            session_start_title,
            loaded_pytest_plugins,
            collected_tests_num,
            expected_progress,
        )
        if expected_word == FAILED_WORD:
            # XPASS(strict)
            expected_lines += (
                failures_title,
                failures_test_name,
                failures_test_reason,
            )
        expected_lines += (
            short_test_summary_title,
            short_test_summary,
        )
        if expected_lowercase == "xpassed" and expected_word == FAILED_WORD:
            # XPASS(strict)
            expected_lines += ("  " + reason_string,)
        expected_lines += (total_summary_line,)
    
        test_module = testdir.makepyfile(
            f"""
            import os
            import signal
    
            import pytest
    
            # The current implementation emits RuntimeWarning.
            pytestmark = pytest.mark.filterwarnings('ignore:pytest-forked xfail')
    
            @pytest.mark.xfail(
                reason='The process gets terminated',
                strict={is_strict!s},
            )
            @pytest.mark.forked
            def test_function():
                {test_func_body!s}
            """
        )
    
        pytest_run_result = testdir.runpytest(test_module, "-ra")
>       pytest_run_result.stdout.fnmatch_lines(expected_lines)
E       Failed: fnmatch: '*==== test session starts ====*'
E          with: '========================================================= test session starts ========================================================='
E       nomatch: 'plugins: forked*'
E           and: 'platform linux -- Python 3.12.0b1, pytest-7.3.1, pluggy-1.0.0'
E           and: 'rootdir: /tmp/pytest-of-mgorny/pytest-2/test_xfail3'
E       fnmatch: 'plugins: forked*'
E          with: 'plugins: forked-1.6.1.dev4+gd9d05e2'
E       exact match: 'collected 1 item'
E       nomatch: 'test_xfail.py X*'
E           and: ''
E       fnmatch: 'test_xfail.py X*'
E          with: 'test_xfail.py X                                                                                                                 [100%]'
E       nomatch: '*==== short test summary info ====*'
E           and: ''
E           and: '========================================================== warnings summary ==========================================================='
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    assertmsg = ast.Str("")'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    keys = [ast.Str(key) for key in current.keys()]'
E           and: ''
E           and: '../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941'
E           and: '  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941: DeprecationWarning: ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead'
E           and: '    clear = ast.Assign(variables, ast.NameConstant(None))'
E           and: ''
E           and: '-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html'
E       fnmatch: '*==== short test summary info ====*'
E          with: '======================================================= short test summary info ======================================================='
E       exact match: 'XPASS test_xfail.py::test_function The process gets terminated'
E       nomatch: '*==== 1 xpassed in 0.*s* ====*'
E           and: '=================================================== 1 xpassed, 4 warnings in 0.01s ===================================================='
E       remains unmatched: '*==== 1 xpassed in 0.*s* ====*'

/tmp/pytest-forked/testing/test_xfail_behavior.py:121: Failed
-------------------------------------------------------- Captured stdout call ---------------------------------------------------------
========================================================= test session starts =========================================================
platform linux -- Python 3.12.0b1, pytest-7.3.1, pluggy-1.0.0
rootdir: /tmp/pytest-of-mgorny/pytest-2/test_xfail3
plugins: forked-1.6.1.dev4+gd9d05e2
collected 1 item

test_xfail.py X                                                                                                                 [100%]

========================================================== warnings summary ===========================================================
../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    assertmsg = ast.Str("")

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    keys = [ast.Str(key) for key in current.keys()]

../../../pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941: DeprecationWarning: ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead
    clear = ast.Assign(variables, ast.NameConstant(None))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================================================= short test summary info =======================================================
XPASS test_xfail.py::test_function The process gets terminated
=================================================== 1 xpassed, 4 warnings in 0.01s ====================================================
========================================================== warnings summary ===========================================================
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:683
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:683
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:683
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:683: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    and isinstance(item.value, ast.Str)

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:685
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:685
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:685: DeprecationWarning: Attribute s is deprecated and will be removed in Python 3.14; use value instead
    doc = item.value.s

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:965: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    inlocs = ast.Compare(ast.Str(name.id), [ast.In()], [locs])

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:968: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    expr = ast.IfExp(test, self.display(name), ast.Str(name.id))

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1102
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1102
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1102: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    syms.append(ast.Str(sym))

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1104
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1104
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:1104: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    expls.append(ast.Str(expl))

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:817: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    keys = [ast.Str(key) for key in current.keys()]

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:927: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    assertmsg = ast.Str("")

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:929: DeprecationWarning: ast.Str is deprecated and will be removed in Python 3.14; use ast.Constant instead
    template = ast.BinOp(assertmsg, ast.Add(), ast.Str(explanation))

.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941
  /tmp/pytest-forked/.tox/py312/lib/python3.12/site-packages/_pytest/assertion/rewrite.py:941: DeprecationWarning: ast.NameConstant is deprecated and will be removed in Python 3.14; use ast.Constant instead
    clear = ast.Assign(variables, ast.NameConstant(None))

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================================================= short test summary info =======================================================
FAILED testing/test_xfail_behavior.py::test_xfail[strict xpass] - Failed: fnmatch: '*==== test session starts ====*'
FAILED testing/test_xfail_behavior.py::test_xfail[non-strict xpass] - Failed: fnmatch: '*==== test session starts ====*'
XFAIL testing/test_boxed.py::test_functional_boxed_capturing[sys] - capture cleanup needed
XFAIL testing/test_boxed.py::test_functional_boxed_capturing[fd] - capture cleanup needed
========================================= 2 failed, 6 passed, 2 xfailed, 37 warnings in 0.66s =========================================

[mgorny]

Hmm, it seems that after patching pytest, it's now failing due to a problem in py:

E           and: 'test_xfail.py::test_function'
E           and: '  /usr/lib/python3.12/site-packages/py/_process/forkedfunc.py:45: DeprecationWarning: This process (pid=66) is multi-threaded, use of fork() may lead to deadlocks in the child.'
E           and: '    pid = os.fork()'

[nicoddemus]

The warnings will be fixed by pytest-dev/pytest#10894.

[mgorny]

The warnings will be fixed by pytest-dev/pytest#10894.

This doesn't fix the warning from py.process.ForkedFunc().