def test_signature(self):
import types
fn = FunctionRef("", -1, "map", "")
arg1 = ArgRef(fn, "fn")
arg2 = ArgRef(fn, "coll")
retval = ArgRef(fn, "")
arg1.add_sample(lambda x: x*x)
arg2.add_sample([1,2,3])
retval.add_sample([1,4,9])
fn.set_signature()
self.assertEqual(fn.signature[""], (-1, ParameterizedList([int])))
self.assertEqual(fn.signature["fn"], (0, types.FunctionType))
self.assertEqual(fn.signature["coll"], (1, ParameterizedList([int])))
