1import minimalmodbus
2from serial.serialutil import SerialException
3
4# We can't test proper behaviour in emulation, because there is
5# actually no emulated modbus hardware, so we rely on the module
6# to fail in an expected way to consider it is working correctly.
7# Failure (of the script) is success (of the test)!
8try:
9    instrument = minimalmodbus.Instrument('/dev/ttyUSB99', 1)
10except SerialException:
11    pass
12