def test_items_in_order_with_7_numbers(self):
# Create a complete binary search tree of 7 items in level-order
items = [4, 2, 6, 1, 3, 5, 7]
tree = BinarySearchTree(items)
# Ensure the in-order traversal of tree items is ordered correctly
assert tree.items_in_order() == [1, 2, 3, 4, 5, 6, 7]
def test_items_in_order_with_3_strings(self):
# Create a complete binary search tree of 3 strings in level-order
items = ['B', 'A', 'C']
tree = BinarySearchTree(items)
# Ensure the in-order traversal of tree items is ordered correctly
assert tree.items_in_order() == ['A', 'B', 'C']