Test failures with Python 3.11: TypeError: super(type, obj): obj must be an instance or subtype of type

[mgorny]

The following tests are failing with Python 3.11.0b3:

FAILED tests/functional/shell/test_daemon.py::test_daemon_process_termination - TypeError: super(type, obj): obj must be an instance...
FAILED tests/functional/shell/test_daemon.py::test_started_context_manager[0.1] - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_started_context_manager[0.3] - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_stopped_context_manager_raises_FactoryNotRunning - TypeError: super(type, obj): o...
FAILED tests/functional/shell/test_daemon.py::test_stopped_context_manager - TypeError: super(type, obj): obj must be an instance or...
FAILED tests/functional/shell/test_daemon.py::test_daemon_callbacks - TypeError: super(type, obj): obj must be an instance or subtyp...
FAILED tests/functional/shell/test_daemon.py::test_daemon_start_check_callbacks - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_daemon_no_start_check_callbacks - TypeError: super(type, obj): obj must be an ins...
FAILED tests/functional/shell/test_daemon.py::test_daemon_start_check_callbacks_factory_not_running - TypeError: super(type, obj): o...
FAILED tests/functional/shell/test_daemon.py::test_context_manager_returns_class_instance - TypeError: super(type, obj): obj must be...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[1] - TypeError: super(type, obj): obj must be an instanc...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[2] - TypeError: super(type, obj): obj must be an instanc...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[3] - TypeError: super(type, obj): obj must be an instanc...

They all seem to have a common cause:

__________________________________________________ test_exact_max_start_attempts[3] ___________________________________________________

tempfiles = <tests.conftest.Tempfiles object at 0x7fd176a05a10>, caplog = <_pytest.logging.LogCaptureFixture object at 0x7fd176a06850>
max_start_attempts = 3

    @pytest.mark.parametrize("max_start_attempts", [1, 2, 3])
    def test_exact_max_start_attempts(
        tempfiles: Tempfiles, caplog: LogCaptureFixture, max_start_attempts: int
    ) -> None:
        """
        This test asserts that we properly report max_start_attempts.
        """
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(0.125)
                sys.exit(1)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=0.1,
            max_start_attempts=max_start_attempts,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:737: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpzx__va2d.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpzx__va2d.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(0.125)
    sys.exit(1)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpzx__va2d.py <<<<<

There's also this warning on top, so perhaps the problem is in attrs:

/tmp/pytest-shell-utilities/.venv/lib/python3.11/site-packages/attr/_make.py:918: RuntimeWarning: Running interpreter doesn't sufficiently support code object introspection.  Some features like bare super() or accessing __class__ will not work with slotted classes.
  set_closure_cell(cell, cls)

Full output

$ pytest
/tmp/pytest-shell-utilities/.venv/lib/python3.11/site-packages/attr/_make.py:918: RuntimeWarning: Running interpreter doesn't sufficiently support code object introspection.  Some features like bare super() or accessing __class__ will not work with slotted classes.
  set_closure_cell(cell, cls)
========================================================= test session starts =========================================================
platform linux -- Python 3.11.0b1, pytest-7.1.2, pluggy-1.0.0
rootdir: /tmp/pytest-shell-utilities, configfile: pytest.ini, testpaths: tests/
plugins: shell-utilities-1.5.0, helpers-namespace-2021.12.29, skip-markers-1.3.0, subtests-0.8.0
collected 78 items                                                                                                                    

tests/functional/test_exceptions.py ........                                                                                    [ 10%]
tests/functional/shell/test_daemon.py FsFFFFFFFFFFFF                                                                            [ 28%]
tests/functional/shell/test_fixture.py .                                                                                        [ 29%]
tests/functional/shell/test_script_subprocess.py .................,,,.                                                          [ 52%]
tests/functional/shell/test_subprocess.py .................                                                                     [ 74%]
tests/unit/customtypes/test_callback.py .....                                                                                   [ 80%]
tests/unit/utils/test_format_callback_to_string.py .....                                                                        [ 87%]
tests/unit/utils/test_ports.py .                                                                                                [ 88%]
tests/unit/utils/test_time.py .                                                                                                 [ 89%]
tests/unit/utils/processes/test_processresult.py ....,,,,.,,,,.                                                                 [ 97%]
tests/unit/utils/processes/test_processresult_matcher.py ..                                                                     [100%]

============================================================== FAILURES ===============================================================
___________________________________________________ test_daemon_process_termination ___________________________________________________

request = <FixtureRequest for <Function test_daemon_process_termination>>
tempfiles = <tests.conftest.Tempfiles object at 0x7fd176945e90>

    def test_daemon_process_termination(request: FixtureRequest, tempfiles: Tempfiles) -> None:
        primary_childrend_count = 5
        secondary_children_count = 3
        script = tempfiles.makepyfile(
            """
            #!{shebang}
            # coding=utf-8
    
            import time
            import multiprocessing
    
            def spin():
                while True:
                    try:
                        time.sleep(0.25)
                    except KeyboardInterrupt:
                        break
    
            def spin_children():
                procs = []
                for idx in range({secondary_children_count}):
                    proc = multiprocessing.Process(target=spin)
                    proc.daemon = True
                    proc.start()
                    procs.append(proc)
    
                while True:
                    try:
                        time.sleep(0.25)
                    except KeyboardInterrupt:
                        break
    
    
            def main():
                procs = []
    
                for idx in range({primary_childrend_count}):
                    proc = multiprocessing.Process(target=spin_children)
                    procs.append(proc)
                    proc.start()
    
                while True:
                    try:
                        time.sleep(0.25)
                    except KeyboardInterrupt:
                        break
    
                # We're not terminating child processes on purpose. Our code should handle it.
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """.format(
                shebang=sys.executable,
                primary_childrend_count=primary_childrend_count,
                secondary_children_count=secondary_children_count,
            ),
            executable=True,
        )
        if not platform.is_windows():
>           daemon = Daemon(start_timeout=1, script_name=script)

tests/functional/shell/test_daemon.py:102: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/tmp8pn5zdel.py', base_script_args=[], check_ports=[], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmp8pn5zdel.py >>>>>
#!/tmp/pytest-shell-utilities/.venv/bin/python
# coding=utf-8

import time
import multiprocessing

def spin():
    while True:
        try:
            time.sleep(0.25)
        except KeyboardInterrupt:
            break

def spin_children():
    procs = []
    for idx in range(3):
        proc = multiprocessing.Process(target=spin)
        proc.daemon = True
        proc.start()
        procs.append(proc)

    while True:
        try:
            time.sleep(0.25)
        except KeyboardInterrupt:
            break


def main():
    procs = []

    for idx in range(5):
        proc = multiprocessing.Process(target=spin_children)
        procs.append(proc)
        proc.start()

    while True:
        try:
            time.sleep(0.25)
        except KeyboardInterrupt:
            break

    # We're not terminating child processes on purpose. Our code should handle it.

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmp8pn5zdel.py <<<<<
__________________________________________________ test_started_context_manager[0.1] __________________________________________________

request = <FixtureRequest for <Function test_started_context_manager[0.1]>>
tempfiles = <tests.conftest.Tempfiles object at 0x7fd1769be790>, start_timeout = 0.1

    @pytest.mark.parametrize("start_timeout", [0.1, 0.3])
    def test_started_context_manager(
        request: FixtureRequest, tempfiles: Tempfiles, start_timeout: float
    ) -> None:
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(3)
                sys.stdout.write("Done!\n")
                sys.stdout.flush()
                sys.exit(0)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=2,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:263: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmp8jfllzsr.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmp8jfllzsr.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(3)
    sys.stdout.write("Done!\n")
    sys.stdout.flush()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmp8jfllzsr.py <<<<<
__________________________________________________ test_started_context_manager[0.3] __________________________________________________

request = <FixtureRequest for <Function test_started_context_manager[0.3]>>
tempfiles = <tests.conftest.Tempfiles object at 0x7fd176a2bcd0>, start_timeout = 0.3

    @pytest.mark.parametrize("start_timeout", [0.1, 0.3])
    def test_started_context_manager(
        request: FixtureRequest, tempfiles: Tempfiles, start_timeout: float
    ) -> None:
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(3)
                sys.stdout.write("Done!\n")
                sys.stdout.flush()
                sys.exit(0)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=2,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:263: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmp8rl81ehs.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmp8rl81ehs.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(3)
    sys.stdout.write("Done!\n")
    sys.stdout.flush()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmp8rl81ehs.py <<<<<
________________________________________ test_stopped_context_manager_raises_FactoryNotRunning ________________________________________

request = <FixtureRequest for <Function test_stopped_context_manager_raises_FactoryNotRunning>>
factory_stopped_script = '/tmp/tmpse8wuja_.py'

    def test_stopped_context_manager_raises_FactoryNotRunning(
        request: FixtureRequest, factory_stopped_script: str
    ) -> None:
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[factory_stopped_script],
            start_timeout=3,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:340: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpse8wuja_.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
--------------------------------------------------------- Captured log setup ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpse8wuja_.py >>>>>
# coding=utf-8

import os
import sys
import time
import socket
import multiprocessing

def main():

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('127.0.0.1', 12345))
    sock.listen(5)
    try:
        while True:
            connection, address = sock.accept()
            connection.close()
    except (KeyboardInterrupt, SystemExit):
        pass
    finally:
        sock.close()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpse8wuja_.py <<<<<
____________________________________________________ test_stopped_context_manager _____________________________________________________

request = <FixtureRequest for <Function test_stopped_context_manager>>, factory_stopped_script = '/tmp/tmplgb2no_s.py'

    def test_stopped_context_manager(request: FixtureRequest, factory_stopped_script: str) -> None:
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[factory_stopped_script],
            start_timeout=3,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:356: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmplgb2no_s.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
--------------------------------------------------------- Captured log setup ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmplgb2no_s.py >>>>>
# coding=utf-8

import os
import sys
import time
import socket
import multiprocessing

def main():

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('127.0.0.1', 12345))
    sock.listen(5)
    try:
        while True:
            connection, address = sock.accept()
            connection.close()
    except (KeyboardInterrupt, SystemExit):
        pass
    finally:
        sock.close()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmplgb2no_s.py <<<<<
________________________________________________________ test_daemon_callbacks ________________________________________________________

request = <FixtureRequest for <Function test_daemon_callbacks>>, factory_stopped_script = '/tmp/tmp70xmlsg7.py'

    def test_daemon_callbacks(request: FixtureRequest, factory_stopped_script: str) -> None:
    
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[factory_stopped_script],
            start_timeout=3,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:420: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmp70xmlsg7.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
--------------------------------------------------------- Captured log setup ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmp70xmlsg7.py >>>>>
# coding=utf-8

import os
import sys
import time
import socket
import multiprocessing

def main():

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('127.0.0.1', 12345))
    sock.listen(5)
    try:
        while True:
            connection, address = sock.accept()
            connection.close()
    except (KeyboardInterrupt, SystemExit):
        pass
    finally:
        sock.close()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmp70xmlsg7.py <<<<<
__________________________________________________ test_daemon_start_check_callbacks __________________________________________________

request = <FixtureRequest for <Function test_daemon_start_check_callbacks>>, factory_stopped_script = '/tmp/tmpvnvgj9f0.py'

    def test_daemon_start_check_callbacks(request: FixtureRequest, factory_stopped_script: str) -> None:
    
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[factory_stopped_script],
            start_timeout=3,
            max_start_attempts=1,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:537: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpvnvgj9f0.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
--------------------------------------------------------- Captured log setup ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpvnvgj9f0.py >>>>>
# coding=utf-8

import os
import sys
import time
import socket
import multiprocessing

def main():

    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('127.0.0.1', 12345))
    sock.listen(5)
    try:
        while True:
            connection, address = sock.accept()
            connection.close()
    except (KeyboardInterrupt, SystemExit):
        pass
    finally:
        sock.close()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpvnvgj9f0.py <<<<<
________________________________________________ test_daemon_no_start_check_callbacks _________________________________________________

request = <FixtureRequest for <Function test_daemon_no_start_check_callbacks>>
tempfiles = <tests.conftest.Tempfiles object at 0x7fd176866ed0>

    def test_daemon_no_start_check_callbacks(request: FixtureRequest, tempfiles: Tempfiles) -> None:
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(3)
                sys.stdout.write("Done!\n")
                sys.stdout.flush()
                sys.exit(0)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=2,
            max_start_attempts=1,
        )

tests/functional/shell/test_daemon.py:584: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...in/python', base_script_args=['/tmp/tmpcm8x7zpk.py'], check_ports=[], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpcm8x7zpk.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(3)
    sys.stdout.write("Done!\n")
    sys.stdout.flush()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpcm8x7zpk.py <<<<<
________________________________________ test_daemon_start_check_callbacks_factory_not_running ________________________________________

request = <FixtureRequest for <Function test_daemon_start_check_callbacks_factory_not_running>>
tempfiles = <tests.conftest.Tempfiles object at 0x7fd176a07fd0>

    def test_daemon_start_check_callbacks_factory_not_running(
        request: FixtureRequest, tempfiles: Tempfiles
    ) -> None:
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(2)
                sys.stdout.write("Done!\n")
                sys.stdout.flush()
                sys.exit(0)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
    
        callbacks = DaemonStartCheckCounter()
    
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=2,
            max_start_attempts=1,
        )

tests/functional/shell/test_daemon.py:627: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...in/python', base_script_args=['/tmp/tmpcrasxtzx.py'], check_ports=[], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpcrasxtzx.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(2)
    sys.stdout.write("Done!\n")
    sys.stdout.flush()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpcrasxtzx.py <<<<<
_____________________________________________ test_context_manager_returns_class_instance _____________________________________________

tempfiles = <tests.conftest.Tempfiles object at 0x7fd176951dd0>

    def test_context_manager_returns_class_instance(tempfiles: Tempfiles) -> None:
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                while True:
                    try:
                        time.sleep(0.1)
                    except KeyboardInterrupt:
                        break
                sys.stdout.write("Done!\n")
                sys.stdout.flush()
                sys.exit(0)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=1,
            max_start_attempts=1,
        )

tests/functional/shell/test_daemon.py:669: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...in/python', base_script_args=['/tmp/tmp1s1v6tho.py'], check_ports=[], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmp1s1v6tho.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    while True:
        try:
            time.sleep(0.1)
        except KeyboardInterrupt:
            break
    sys.stdout.write("Done!\n")
    sys.stdout.flush()
    sys.exit(0)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmp1s1v6tho.py <<<<<
__________________________________________________ test_exact_max_start_attempts[1] ___________________________________________________

tempfiles = <tests.conftest.Tempfiles object at 0x7fd17720cb10>, caplog = <_pytest.logging.LogCaptureFixture object at 0x7fd17720ead0>
max_start_attempts = 1

    @pytest.mark.parametrize("max_start_attempts", [1, 2, 3])
    def test_exact_max_start_attempts(
        tempfiles: Tempfiles, caplog: LogCaptureFixture, max_start_attempts: int
    ) -> None:
        """
        This test asserts that we properly report max_start_attempts.
        """
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(0.125)
                sys.exit(1)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=0.1,
            max_start_attempts=max_start_attempts,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:737: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpcuvn3fc5.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpcuvn3fc5.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(0.125)
    sys.exit(1)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpcuvn3fc5.py <<<<<
__________________________________________________ test_exact_max_start_attempts[2] ___________________________________________________

tempfiles = <tests.conftest.Tempfiles object at 0x7fd176862fd0>, caplog = <_pytest.logging.LogCaptureFixture object at 0x7fd1768637d0>
max_start_attempts = 2

    @pytest.mark.parametrize("max_start_attempts", [1, 2, 3])
    def test_exact_max_start_attempts(
        tempfiles: Tempfiles, caplog: LogCaptureFixture, max_start_attempts: int
    ) -> None:
        """
        This test asserts that we properly report max_start_attempts.
        """
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(0.125)
                sys.exit(1)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=0.1,
            max_start_attempts=max_start_attempts,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:737: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpu0ohx8bm.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpu0ohx8bm.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(0.125)
    sys.exit(1)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpu0ohx8bm.py <<<<<
__________________________________________________ test_exact_max_start_attempts[3] ___________________________________________________

tempfiles = <tests.conftest.Tempfiles object at 0x7fd176a05a10>, caplog = <_pytest.logging.LogCaptureFixture object at 0x7fd176a06850>
max_start_attempts = 3

    @pytest.mark.parametrize("max_start_attempts", [1, 2, 3])
    def test_exact_max_start_attempts(
        tempfiles: Tempfiles, caplog: LogCaptureFixture, max_start_attempts: int
    ) -> None:
        """
        This test asserts that we properly report max_start_attempts.
        """
        script = tempfiles.makepyfile(
            r"""
            # coding=utf-8
    
            import sys
            import time
            import multiprocessing
    
            def main():
                time.sleep(0.125)
                sys.exit(1)
    
            # Support for windows test runs
            if __name__ == '__main__':
                multiprocessing.freeze_support()
                main()
            """,
            executable=True,
        )
>       daemon = Daemon(
            script_name=sys.executable,
            base_script_args=[script],
            start_timeout=0.1,
            max_start_attempts=max_start_attempts,
            check_ports=[12345],
        )

tests/functional/shell/test_daemon.py:737: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
<attrs generated init pytestshellutils.shell.Daemon>:41: in __init__
    self.__attrs_post_init__()
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = Daemon(cwd=PosixPath('/tmp/pytest-shell-utilities'), slow_stop=True, timeout=None, script_name='/tmp/pytest-shell-util...thon', base_script_args=['/tmp/tmpzx__va2d.py'], check_ports=[12345], extra_cli_arguments_after_first_start_failure=[])

    def __attrs_post_init__(self) -> None:
        """
        Post ``attrs`` class initialization routines.
        """
>       super().__attrs_post_init__()
E       TypeError: super(type, obj): obj must be an instance or subtype of type

.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:917: TypeError
---------------------------------------------------------- Captured log call ----------------------------------------------------------
DEBUG    tests.conftest:conftest.py:78 Created python file with contents:
>>>>> /tmp/tmpzx__va2d.py >>>>>
# coding=utf-8

import sys
import time
import multiprocessing

def main():
    time.sleep(0.125)
    sys.exit(1)

# Support for windows test runs
if __name__ == '__main__':
    multiprocessing.freeze_support()
    main()
<<<<< /tmp/tmpzx__va2d.py <<<<<
========================================================== warnings summary ===========================================================
tests/functional/shell/test_daemon.py: 13 warnings
tests/functional/shell/test_fixture.py: 1 warning
tests/functional/shell/test_script_subprocess.py: 20 warnings
tests/functional/shell/test_subprocess.py: 17 warnings
  /tmp/pytest-shell-utilities/.venv/lib/python3.11/site-packages/pytestshellutils/shell.py:378: DeprecationWarning: Use setlocale(), getencoding() and getlocale() instead
    encoding = locale.getdefaultlocale()[-1]

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
======================================================= short test summary info =======================================================
FAILED tests/functional/shell/test_daemon.py::test_daemon_process_termination - TypeError: super(type, obj): obj must be an instance...
FAILED tests/functional/shell/test_daemon.py::test_started_context_manager[0.1] - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_started_context_manager[0.3] - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_stopped_context_manager_raises_FactoryNotRunning - TypeError: super(type, obj): o...
FAILED tests/functional/shell/test_daemon.py::test_stopped_context_manager - TypeError: super(type, obj): obj must be an instance or...
FAILED tests/functional/shell/test_daemon.py::test_daemon_callbacks - TypeError: super(type, obj): obj must be an instance or subtyp...
FAILED tests/functional/shell/test_daemon.py::test_daemon_start_check_callbacks - TypeError: super(type, obj): obj must be an instan...
FAILED tests/functional/shell/test_daemon.py::test_daemon_no_start_check_callbacks - TypeError: super(type, obj): obj must be an ins...
FAILED tests/functional/shell/test_daemon.py::test_daemon_start_check_callbacks_factory_not_running - TypeError: super(type, obj): o...
FAILED tests/functional/shell/test_daemon.py::test_context_manager_returns_class_instance - TypeError: super(type, obj): obj must be...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[1] - TypeError: super(type, obj): obj must be an instanc...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[2] - TypeError: super(type, obj): obj must be an instanc...
FAILED tests/functional/shell/test_daemon.py::test_exact_max_start_attempts[3] - TypeError: super(type, obj): obj must be an instanc...
============================== 13 failed, 64 passed, 1 skipped, 51 warnings, 11 subtests passed in 5.45s ==============================

[mgorny]

Oh, it's probably python-attrs/attrs#907, and this is the first package I found to be affected by it.

[mgorny]

One possible workaround is not to use slots=True.