code: def test_iteration():
      t = Trie(default=lambda: "default", path_constructor=tuple)
  
      t.get_node((1, 2, 3)).value = "123"
      t.get_node((1, 2, 4)).value = "124"
      expected = [
          ((), "default"),
          ((1,), "default"),
          ((1, 2), "default"),
          ((1, 2, 3), "123"),
          ((1, 2, 4), "124"),
      ]
  
      for i, value in enumerate(t):
          assert value == expected[i]
  
imports: from featuretools.utils import Trie
label_desc: Use image node_id 3 for calling a global function with example usage: test_iteration() without return types