docstr: Tests when an argument expects a default and it is present.
docstr_tok: ["Tests","when","an","argument","expects","a","default","and","it","is","present","."]
code: def test_default(self):
      """
      Tests when an argument expects a default and it is present.
      """
  
      def f(a=1):
          pass
  
      verify_callable_argspec(f, [Argument("a", 1)])
  
imports: from unittest import TestCase
  from catalyst.utils.argcheck import verify_callable_argspec, Argument, NoStarargs, UnexpectedStarargs, NoKwargs, UnexpectedKwargs, NotCallable, NotEnoughArguments, TooManyArguments, MismatchedArguments
label_desc: Use image node_id 13 for calling the TestArgCheck obj's underlying member method code with example usage: obj.test_default() without return types