Added a new test case in test_argsParser.py

[arilloid]

Hello @gitdevjin ,

I added a new test case in test_argsParser.py to make sure that the argument parser terminates the program with a non-zero code when invoked with an invalid flag.

# Test invalid flag argument option
def test_arg_parser_invalid_option():
    with patch("sys.argv", ["code_mage.py", "--invalid"]):
        with pytest.raises(SystemExit) as excinfo:
            arg_parser({})
        assert excinfo.type is SystemExit
        assert excinfo.value.code != 0

[gitdevjin]

looks good