def test_map_simple(self):
     result = tdc.map(lambda x: x * 2, range(10))
     self.assertListEqual(
         result,
         [x * 2 for x in range(10)])
 def test_map_empty(self):
     result = tdc.map(lambda x: x * 2, [])
     self.assertListEqual(
         result, [])