Write unit test cases for the following
import argparse
import logging
import sys
import yaml

from wekapyutils.wekalogging import configure_logging, register_module
from RedFishBMC import RedFishBMC
from tabulate import tabulate

# get root logger
log = logging.getLogger()


def _load_config(inputfile):
    try:
        f = open(inputfile)
    except Exception as exc:
        raise
    with f:
        try:
            return yaml.load(f, Loader=yaml.FullLoader)
        except AttributeError:
            return yaml.load(f)
        except Exception as exc:
            log.error(f"Error reading config file: {exc}")
            raise


def bios_diff(hostlist):
    hosta = hostlist[0]
    hostb = hostlist[1]

    hosta_bios = hosta.bios_data.dict['Attributes']
    hostb_bios = hostb.bios_data.dict['Attributes']

    if hosta.arch != hostb.arch:
        print()
        print("WARNING: Hosts are of different architectures!")

    diff = list()
    settings_not_present = list()
    for setting, value in hosta_bios.items():
        if setting not in hostb_bios:
            settings_not_present.append([setting, value, "setting not present"])
        elif hostb_bios[setting] != value:
            diff.append([setting, value, hostb_bios[setting]])

    # check for settings in b that are not in a
    for setting, value in hostb_bios.items():
        if setting not in hosta_bios:
            settings_not_present.append([setting, "setting not present", value])

    are_different = False
    if len(diff) > 0:
        print() Do not say the word "file" in the response
user