def can_take_Argument_instance(self):
c = Context()
a = Argument(names=('foo',))
c.add_arg(a)
assert c.get_arg('foo') is a
def returns_Argument_for_given_name(self):
c = Context()
a = Argument(name='foo')
c.add_arg(a)
assert c.get_arg('foo') is a
def may_give_arg_list_at_init_time(self):
a1 = Argument('foo')
a2 = Argument('bar')
c = Context(name='name', args=(a1, a2))
assert c.get_arg('foo') is a1
