human
Complete the below
@pytest.mark.parametrize('value,    typ', [(None, None), (42, int)])
def test_conv_default_param(value, typ):

    ''''The default value should always be a valid choice.'
    '''
 Write me a the Python program you requested?
assistant
#Here is the Python program you requested.
    def func(foo=value):
        pass
    param = inspect.signature(func).parameters['foo']
    assert (argparser.type_conv(param, typ, value, str_choices=['val']) == value)