def test__forward_open_returns_false_if_falsy_response():
driver = CIPDriver(CONNECT_PATH)
driver._sock = Mocket()
driver._session = 1
assert not driver._forward_open()
def test__forward_open_raises_commerror_if_session_is_zero():
driver = CIPDriver(CONNECT_PATH)
with pytest.raises(CommError):
driver._forward_open()
def test__forward_open_returns_true_if_already_connected():
driver = CIPDriver(CONNECT_PATH)
driver._target_is_connected = True
assert driver._forward_open()
