text: from binary_tree.two_sum_iv import two_sum_iv
  from test_helpers.test_helpers import get_binary_tree, TreeNode
  
  
  def test_two_sum_iv():
      tree = TreeNode(1)
      assert not two_sum_iv(tree, 2)
  
      tree = get_binary_tree()
      assert two_sum_iv(tree, 5)
      assert not two_sum_iv(tree, 1)
      assert not two_sum_iv(tree, 10)
  