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import pytest
from serial import Serial, serial_for_url
from umodbus.server.serial.rtu import RTUServer, get_char_size
@pytest.fixture
def rtu_server():
return RTUServer()
def test_get_char_size():
""" Test if correct char size is calculated. """
assert get_char_size(11) == 1
assert get_char_size(19201) == 0.0005
def test_rtu_server_create_response_adu(rtu_server):
assert rtu_server.create_response_adu({'unit_id': 1}, b'') == b'\x01~\x80'
def test_rtu_server_serial_port(rtu_server):
"""" Test if RTUServer.serial_port sets correct timeout and
inter_byte_timeout. """
serial_port = Serial(baudrate=19201)
rtu_server.serial_port = serial_port
assert rtu_server.serial_port.timeout == 0.00175
assert rtu_server.serial_port.inter_byte_timeout == 0.00075
def test_rtu_server_send_empty_message(rtu_server):
rtu_server.serial_port = serial_for_url('loop://')
rtu_server.serial_port.write(b'')
with pytest.raises(ValueError):
rtu_server.serve_once()
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