def test_write_readline_fail(unused_tcp_port):
sock = TCP("0", unused_tcp_port)
assert not sock.connected()
assert sock.connection_counter == 0
with pytest.raises(ConnectionRefusedError):
sock.write_readline(IDN_REQ)
assert not sock.connected()
assert sock.connection_counter == 0
def test_open_fail(unused_tcp_port):
sock = TCP("0", unused_tcp_port)
assert not sock.connected()
assert sock.connection_counter == 0
with pytest.raises(ConnectionRefusedError):
sock.open()
assert not sock.connected()
assert sock.connection_counter == 0
def test_socket_creation():
sock = TCP("example.com", 34567)
assert sock.host == "example.com"
assert sock.port == 34567
assert not sock.connected()
assert sock.connection_counter == 0