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import pytest
from serial import serial_for_url
from umodbus.client.serial.rtu import send_message, read_coils
def test_send_message_with_timeout():
""" Test if TimoutError is raised when serial port doesn't receive enough
data.
"""
s = serial_for_url('loop://', timeout=0)
# As we are using a loop, the sent request will be read back as response.
# To test timeout use a request that needs more bytes for the response.
message = read_coils(slave_id=0, starting_address=1, quantity=40)
with pytest.raises(ValueError):
send_message(message, s)
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