I have a question about Python libraries and testing scope.
If I'm importing 'serial' in my library, and use it like the following to create a connection to a sensor:
--- start code ---
import serial
class Sensor:
def __init__(self, serial_device):
self.__serial_device = serial_device
try:
self.__connection = serial.Serial(
port=serial_device,
baudrate=9600,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
)
except serial.SerialException:
print("Could not establish serial connection to sensor")
--- end code ---
how much testing should I do around the serial connection? Just mock up a few buffers (byte streams), and see how my class handles unexpected input?
One the one hand, I want to make the library as solid as possible. On the other hand, I don't want to run tests on code I don't control (the library module). I know of the 'mock-serial' utility, but haven't used it.
The aim is to make a Python version of my Arduino library for the CozIR Ambient CO2 sensor: