text: import pytest
  from trees.binary_tree import KaryTree, KaryNode, Node, BinaryTree, BinarySearchTree, fizz_buzz_conditions, fizz_buzz_tree
  
  # @pytest.mark.skip("pending")
  def test_node_has_value():
      node = Node("apple")
      assert node.value == "apple"
  
  def test_node_has_left_of_none():
      node = Node("apple")
      assert node.left is None
  
  def test_node_has_right_of_none():
      node = Node("apple")
      assert node.right is None
  
  def test_create_binary_tree():
      tree = BinaryTree()
      assert tree
  
  def test_binary_tree_has_root():
      tree = BinaryTree()
      assert tree.root is None
  
  def test_create_binary_search_tree():
      tree = BinarySearchTree()
      assert tree
  
  def test_pre_order_add_left_and_right():
      tree = BinaryTree()
      tree.root = Node(1)
      tree.root.right = Node(3)
      tree.root.left = Node(4)
      actual = tree.pre_order()
      assert actual == [1, 4, 3]
  
  def test_in_order_add_left_and_right():
      tree = BinaryTree()
      tree.root = Node(1)
      tree.root.left = Node(2)
      tree.root.right = Node(3)
      tree.root.left.left = Node(4)
      tree.root.left.right = Node(5)
      actual = tree.in_order()
      assert actual == [4, 2, 5, 1, 3]
  
  def test_post_order_add_left_and_right():
      tree = BinaryTree()
      tree.root = Node(1)
      tree.root.left = Node(2)
      tree.root.right = Node(3)
      tree.root.left.left = Node(4)
      tree.root.left.right = Node(5)
      actual = tree.post_order()
      assert actual == [4, 5, 2, 3, 1]
  
  def test_max_binary_tree():
      tree = BinaryTree()
      tree.root = Node(1)
      tree.root.left = Node(2)
      tree.root.right = Node(3)
      tree.root.left.left = Node(7)
      tree.root.left.right = Node(5)
      assert tree.find_max_using_order_function() == 7
  
  def test_bst_add_multiple():
      tree = BinarySearchTree()
      tree.add(1)
      tree.add(2)
      tree.add(3)
      actual = tree.pre_order()
      assert tree.root.value == 1
      assert actual == [1, 2, 3]
  
  def test_contains_true():
      tree = BinarySearchTree()
      tree.add(1)
      tree.add(2)
      tree.add(3)
      actual = tree.contains(3)
      assert actual == True
  
  def test_contains_false():
      tree = BinarySearchTree()
      tree.add(1)
      tree.add(2)
      tree.add(4)
      actual = tree.contains(3)
      assert actual == False
  
  def test_find_max():
      tree = BinarySearchTree()
      tree.add(1)
      tree.add(2)
      tree.add(4)
      actual = tree.max()
      assert actual == 4
  
  def test_find_max_2():
      tree = BinarySearchTree()
      tree.add(346)
      tree.add(34)
      tree.add(7532)
      tree.add(65)
      tree.add(57)
      actual = tree.max()
      assert actual == 7532
  
  def test_find_max_empty():
      tree = BinarySearchTree()
      actual = tree.max()
      assert actual ==  "Empty Tree"
  
  def breadth_first_traversal():
      tree = BinarySearchTree()
      tree.root = Node(3)
      tree.root.left = Node(2)
      tree.root.right = Node(11)
      tree.root.left.left = Node(1)
      tree.root.right.right = Node(8)
      actual = tree.binary_tree_breadth_first()
      assert actual == [3, 2, 11, 1, 8]
  
  def test_negative(negative_tree):
      actual = negative_tree.breadth_first()
      assert actual == [-2, -7, -5, -2, -9]
  
  def test_kary_tree_bfs_single_node():
      tree = KaryTree()
      tree.root = KaryNode(3)
      assert tree.root.value == 3
      assert tree.root.children == []
  
  def test_kary_tree_bfs_returns_correct_values():
      node5 = KaryNode(5)
      node4 = KaryNode(4, [node5])
      node3 = KaryNode(3)
      node2 = KaryNode(2)
      node1 = KaryNode(1, [node2, node3, node4])
      tree = KaryTree(node1)
      actual = tree.kary_breadth_first()
      expected = [1, 2, 3, 4, 5]
      assert actual == expected
  
  def test_fizz_buzz_conditions_returns_fizzbuzz():
      assert fizz_buzz_conditions(15) == "FizzBuzz"
  def test_fizz_buzz_conditions_returns_fizz():
      assert fizz_buzz_conditions(3) == "Fizz"
  def test_fizz_buzz_conditions_returns_buzz():
      assert fizz_buzz_conditions(5) == "Buzz"
  
  def test_fizz_buzz_tree_raises_error_on_empty_tree():
      empty_tree = KaryTree()
      with pytest.raises(Exception):
          fizz_buzz_tree(empty_tree)
  
  def test_kary_tree_bfs_returns_correct_values():
      node6 = KaryNode(30)
      node5 = KaryNode(5)
      node4 = KaryNode(4, [node5, node6])
      node3 = KaryNode(3)
      node2 = KaryNode(2)
      node1 = KaryNode(1, [node2, node3, node4])
      tree = KaryTree(node1)
      fizz_buzz_tree(tree)
      actual = tree.kary_breadth_first()
      expected = ["1", "2", "Fizz", "4", "Buzz", "FizzBuzz"]
      assert actual == expected
  
  @pytest.fixture
  def negative_tree():
      tree = BinarySearchTree()
      tree.root = Node(-2)
      tree.root.left = Node(-7)
      tree.root.right = Node(-5)
      tree.root.left.left = Node(-2)
      tree.root.right.right = Node(-9)
      return tree
  