`host.service('test').is_running` is throwing _Unexpected exit code 4_ exception on Ubuntu 24

[pfuntner]

systemctl is-active FOOBAR (where FOOBAR is a non-existent service) is behaving differently on Ubuntu 24. It has exit code 4 rather than exit code 3 on releases such as Ubuntu 20 and Ubuntu 22.

$ python3 -m pip list | grep -P pytest\|testinfra
pytest           8.3.3
pytest-testinfra 10.1.1
testinfra        6.0.0
$ cat ~/tmp/test_service.py
def test_service1(host):
  print(f'\ntest_service1: {host.service("test").is_running}')

def test_service2(host):
  running = host.run_expect([0, 1, 3, 4, 8], 'systemctl is-active test').rc == 0
  print(f'\ntest_service2: {running}')
$ pytest -s --connection ssh --hosts gcp-ubuntu2404 ~/tmp/test_service.py
/home/jpfuntne/third-party/pytest/lib/python3.11/site-packages/_testinfra_renamed.py:5: DeprecationWarning: testinfra package has been renamed to pytest-testinfra. Please `pip install pytest-testinfra` and `pip uninstall testinfra` and update your package requirements to avoid this message
  warnings.warn((
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.11.0rc1, pytest-8.3.3, pluggy-1.5.0
rootdir: /home/jpfuntne
plugins: testinfra-10.1.1, testinfra-6.0.0
collected 2 items

../tmp/test_service.py F
test_service2: False
.

========================================================================================== FAILURES ==========================================================================================
____________________________________________________________________________ test_service1[ssh://gcp-ubuntu2404] _____________________________________________________________________________

host = <testinfra.host.Host ssh://gcp-ubuntu2404>

    def test_service1(host):
>     print(f'\ntest_service1: {host.service("test").is_running}')

../tmp/test_service.py:2:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pytest/lib/python3.11/site-packages/testinfra/modules/service.py:184: in is_running
    out = self.run_expect([0, 1, 3], "systemctl is-active %s", self.name)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

cls = <class 'testinfra.modules.base.SystemdService'>, args = ([0, 1, 3], 'systemctl is-active %s', 'test'), kwargs = {}

    @classmethod
    def run_expect(cls, *args, **kwargs):
>       return cls._host.run_expect(*args, **kwargs)
E       AssertionError: Unexpected exit code 4 for CommandResult(backend=<testinfra.backend.ssh.SshBackend object at 0x7f63929a79d0>, exit_status=4, command=b'systemctl is-active test', _stdout=b'inactive\n', _stderr=b'')
E       assert 4 in [0, 1, 3]
E        +  where 4 = CommandResult(backend=<testinfra.backend.ssh.SshBackend object at 0x7f63929a79d0>, exit_status=4, command=b'systemctl is-active test', _stdout=b'inactive\n', _stderr=b'').rc

pytest/lib/python3.11/site-packages/testinfra/modules/base.py:44: AssertionError
================================================================================== short test summary info ===================================================================================
FAILED ../tmp/test_service.py::test_service1[ssh://gcp-ubuntu2404] - AssertionError: Unexpected exit code 4 for CommandResult(backend=<testinfra.backend.ssh.SshBackend object at 0x7f63929a79d0>, exit_status=4, command=b'systemctl is-active test', _stdout...
================================================================================ 1 failed, 1 passed in 2.21s =================================================================================
$

test_service2() is similar to SysvService.is_running() but accepts an exit status of 4 as well.

Here's an example of the same script working as expected on Ubuntu 22:

$ pytest -s --connection ssh --hosts gcp-ubuntu2204 ~/tmp/test_service.py
/home/jpfuntne/third-party/pytest/lib/python3.11/site-packages/_testinfra_renamed.py:5: DeprecationWarning: testinfra package has been renamed to pytest-testinfra. Please `pip install pytest-testinfra` and `pip uninstall testinfra` and update your package requirements to avoid this message
  warnings.warn((
==================================================================================== test session starts =====================================================================================
platform linux -- Python 3.11.0rc1, pytest-8.3.3, pluggy-1.5.0
rootdir: /home/jpfuntne
plugins: testinfra-10.1.1, testinfra-6.0.0
collected 2 items

../tmp/test_service.py
test_service1: False
.
test_service2: False
.

===================================================================================== 2 passed in 2.36s ======================================================================================
$

[pfuntner]

I think this issue is a dupe of #748 which is fixed by #773

[pfuntner]

I found similar behavior in another method and opened #801