def parse_arguments(argv):
"""Consume known command line arguments."""
parser = ExceptionRaisingArgumentParser(
prog="canbus_explorer",
description=canbus_explorer.__doc__,
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
"-v",
"--version",
action="version",
version=canbus_explorer.__version__,
help="Print the Canbus Explorer version and exit.",
)
parsed_args, remaining_argv = parser.parse_known_args(argv)
return parsed_args, remaining_argv
class ValidateExceptionRaising(unittest.TestCase):
"""Verify that the ArgumentParser raises a checked exception
instead of default behaviour of an unchecked exception (which
terminates the runtime)."""
def setUp(self):
self._stderr = sys.stderr
sys.stderr = DevNull()
self.argparser = ExceptionRaisingArgumentParser()
def tearDown(self):
sys.stderr = self._stderr
def test_can_create_arg_parser(self):
self.assertIsInstance(self.argparser, argparse.ArgumentParser)
def test_raises_checked_exceptions(self):
self.argparser.add_argument("-r", "--required", required=True)
self.assertRaises(ArgumentParsingError, self.argparser.parse_args)
def setUp(self):
self._stderr = sys.stderr
sys.stderr = DevNull()
self.argparser = ExceptionRaisingArgumentParser()