tests: test more reliably if port 25 is reachable - #580

________________________________________________________________________________________________ test_reject_missing_dkim[fake@example.org] _________________________________________________________________________________________________
[gw3] linux -- Python 3.12.3 /home/user/code/pyinfra-sysadmin/servers/nine.testrun.org/chatmail/venv/bin/python3

cmsetup = <cmdeploy.tests.plugin.CMSetup object at 0x76ef7f480200>, maildata = <function maildata.<locals>.maildata at 0x76ef7f677600>, from_addr = 'fake@example.org'

    @pytest.mark.parametrize("from_addr", ["fake@example.org", "fake@testrun.org"])
    def test_reject_missing_dkim(cmsetup, maildata, from_addr):
        recipient = cmsetup.gen_users(1)[0]
        msg = maildata(
            "encrypted.eml", from_addr=from_addr, to_addr=recipient.addr
        ).as_string()
        try:
>           conn = smtplib.SMTP(cmsetup.maildomain, 25, timeout=10)

cmdeploy/src/cmdeploy/tests/online/test_1_basic.py:126: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/usr/lib/python3.12/smtplib.py:255: in __init__
    (code, msg) = self.connect(host, port)
/usr/lib/python3.12/smtplib.py:341: in connect
    self.sock = self._get_socket(host, port, self.timeout)
/usr/lib/python3.12/smtplib.py:312: in _get_socket
    return socket.create_connection((host, port), timeout,
/usr/lib/python3.12/socket.py:852: in create_connection
    raise exceptions[0]
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

address = ('ten.testrun.org', 25), timeout = 10, source_address = None

    def create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,
                          source_address=None, *, all_errors=False):
        """Connect to *address* and return the socket object.
    
        Convenience function.  Connect to *address* (a 2-tuple ``(host,
        port)``) and return the socket object.  Passing the optional
        *timeout* parameter will set the timeout on the socket instance
        before attempting to connect.  If no *timeout* is supplied, the
        global default timeout setting returned by :func:`getdefaulttimeout`
        is used.  If *source_address* is set it must be a tuple of (host, port)
        for the socket to bind as a source address before making the connection.
        A host of '' or port 0 tells the OS to use the default. When a connection
        cannot be created, raises the last error if *all_errors* is False,
        and an ExceptionGroup of all errors if *all_errors* is True.
        """
    
        host, port = address
        exceptions = []
        for res in getaddrinfo(host, port, 0, SOCK_STREAM):
            af, socktype, proto, canonname, sa = res
            sock = None
            try:
                sock = socket(af, socktype, proto)
                if timeout is not _GLOBAL_DEFAULT_TIMEOUT:
                    sock.settimeout(timeout)
                if source_address:
                    sock.bind(source_address)
>               sock.connect(sa)
E               OSError: [Errno 101] Network is unreachable

/usr/lib/python3.12/socket.py:837: OSError
----------------------------------------------------------------------------------------------------------- Captured stdout call ------------------------------------------------------------------------------------------------------------
Creating 1 online users
smtp-connect ten.testrun.org
smtp-login 'ac1_ad912n@ten.testrun.org' 'vcj9jm31bh6hzbj1jptm'