def test_binary_search_tree(self): # initialize test variables BST = BinarySearchTree() seq = range(1000) # randomly insert values into BST random.shuffle(seq) for val in seq: BST.insert(val) self.assertEqual(BST.find(val), val) # test that values are present in BST for val in seq: self.assertEqual(BST.find(val), val) # test inorder traversal of BST seq.sort() self.assertEqual(BST.traverse(), seq) # randomly remove values from BST random.shuffle(seq) for val in seq: self.assertEqual(BST.find(val), val) BST.delete(val) self.assertEqual(BST.find(val), None) # test that values are not present in BST for val in seq: self.assertEqual(BST.find(val), None)
class BinarySearchTreeTest(unittest.TestCase): def setUp(self): self.empty_bst = BinarySearchTree() self.one_node_bst = BinarySearchTree() self.one_node_bst.insert(1) # ______8 # / \ # 3__ 10___ # / \ \ # 1 6 _14 # / \ / # 4 7 13 self.insert_items = [8, 3, 10, 1, 6, 14, 4, 7, 13] self.bst = BinarySearchTree() for i in self.insert_items: self.bst.insert(i) array = binarytree.bst(is_perfect=True).values self.perfect_bst = BinarySearchTree.from_array_representation(array) def test__eq__(self): tree_1 = BinarySearchTree() for i in self.insert_items: tree_1.insert(i) self.assertEqual(self.bst, tree_1) tree_2 = BinarySearchTree() for i in [1, 2, 3]: tree_2.insert(i) self.assertNotEqual(self.bst, tree_2) self.assertNotEqual(self.bst, self.empty_bst) def test__len__(self): self.assertEqual(len(self.empty_bst), 0) self.assertEqual(len(self.bst), len(self.insert_items)) def test__iter__(self): items = list(self.bst) expected = [8, 3, 10, 1, 6, 14, 4, 7, 13] self.assertEqual(items, expected) def test__contains__(self): self.assertIn(random.choice(self.insert_items), self.bst) self.assertNotIn(100, self.bst) def test_is_valid(self): self.assertEqual(self.empty_bst.is_valid(), True) self.assertEqual(self.one_node_bst.is_valid(), True) self.assertEqual(self.bst.is_valid(), True) def test_is_full(self): self.assertEqual(self.empty_bst.is_full(), True) self.assertEqual(self.one_node_bst.is_full(), True) self.assertEqual(self.bst.is_full(), False) self.assertEqual(self.perfect_bst.is_full(), True) def test_is_complate(self): self.assertEqual(self.empty_bst.is_complate(), True) self.assertEqual(self.one_node_bst.is_complate(), True) self.assertEqual(self.bst.is_complate(), False) self.assertEqual(self.perfect_bst.is_complate(), True) def test_is_balanced(self): self.assertEqual(self.empty_bst.is_balanced(), True) self.assertEqual(self.one_node_bst.is_balanced(), True) self.assertEqual(self.bst.is_balanced(), False) self.assertEqual(self.perfect_bst.is_balanced(), True) def test_is_perfect(self): self.assertEqual(self.empty_bst.is_perfect(), True) self.assertEqual(self.one_node_bst.is_perfect(), True) self.assertEqual(self.bst.is_perfect(), False) self.assertEqual(self.perfect_bst.is_perfect(), True) def test_is_root(self): self.assertEqual(self.bst.is_root(self.bst.root), True) self.assertEqual(self.bst.is_root(self.bst.root.left), False) self.assertEqual(self.bst.is_root(self.bst.root.right), False) def test_children(self): self.assertEqual(list(self.bst.children(self.bst.root)), [self.bst.root.left, self.bst.root.right]) self.assertEqual(list(self.bst.children(self.bst.root.left)), [self.bst.root.left.left, self.bst.root.left.right]) self.assertEqual(list(self.bst.children(self.bst.root.right)), [ self.bst.root.right.right, ]) self.assertEqual(list(self.bst.children(self.bst.root.left.left)), []) def test_num_children(self): self.assertEqual(self.bst.num_children(self.bst.root), 2) self.assertEqual(self.bst.num_children(self.bst.root.left), 2) self.assertEqual(self.bst.num_children(self.bst.root.right), 1) self.assertEqual(self.bst.num_children(self.bst.root.left.left), 0) def test_is_leaf(self): self.assertEqual(self.bst.is_leaf(self.bst.root.left.left), True) self.assertEqual(self.bst.is_leaf(self.bst.root.left.right.left), True) self.assertEqual(self.bst.is_leaf(self.bst.root.left.right.right), True) self.assertEqual(self.bst.is_leaf(self.bst.root.right.right.left), True) self.assertEqual(self.bst.is_leaf(self.bst.root), False) self.assertEqual(self.bst.is_leaf(self.bst.root.left), False) self.assertEqual(self.bst.is_leaf(self.bst.root.right), False) def test_height(self): self.assertEqual(self.empty_bst.height(), -1) self.assertEqual(self.one_node_bst.height(), 0) self.assertEqual(self.bst.height(), 3) self.assertEqual(self.bst.height(self.bst.root.left.left), 0) self.assertEqual(self.bst.height(self.bst.root.left.right), 1) self.assertEqual(self.bst.height(self.bst.root.right), 2) self.bst.insert(15) self.bst.insert(30) self.assertEqual(self.bst.height(), 4) def test_depth(self): self.assertEqual(self.bst.depth(self.bst.root), 0) self.assertEqual(self.bst.depth(self.bst.root.right), 1) self.assertEqual(self.bst.depth(self.bst.root.right.right), 2) self.assertEqual(self.bst.depth(self.bst.root.left.right.left), 3) self.bst.insert(15) self.bst.insert(30) self.assertEqual(self.bst.depth(self.bst.root.right.right.right.right), 4) def test_level(self): self.assertEqual(self.bst.level(self.bst.root), 1) self.assertEqual(self.bst.level(self.bst.root.right), 2) self.assertEqual(self.bst.level(self.bst.root.right.right), 3) self.assertEqual(self.bst.level(self.bst.root.left.right.left), 4) self.bst.insert(15) self.bst.insert(30) self.assertEqual(self.bst.level(self.bst.root.right.right.right.right), 5) def test_num_edges(self): self.assertEqual(self.empty_bst.num_edges(), 0) self.assertEqual(self.bst.num_edges(), len(self.bst) - 1) def test_search(self): self.assertEqual(self.bst.search(8), self.bst.root) self.assertEqual(self.bst.search(1), self.bst.root.left.left) self.assertEqual(self.bst.search(13), self.bst.root.right.right.left) self.assertEqual(self.bst.search(100), None) def test_get_min_node(self): self.assertEqual(self.bst.get_min_node().value, min(self.insert_items)) def test_get_max_node(self): self.assertEqual(self.bst.get_max_node().value, max(self.insert_items)) def test_delete(self): with self.assertRaises(ValueError): self.bst.delete(100) bst2 = pythonds3.BinarySearchTree() for i in self.insert_items: bst2.put(key=i, value=i) # ______8 # / \ # 3__ 10___ # \ \ # 6 _14 # / \ / # 4 7 13 self.bst.delete(1) bst2.delete(1) self.assertEqual(len(self.bst), len(bst2)) self.assertEqual(list(self.bst.traverse()), list(bst2)) self.assertEqual(self.bst.is_valid(), True) # ______10___ # / \ # 3__ _14 # \ / # 6 13 # / \ # 4 7 self.bst.delete(8) bst2.delete(8) self.assertEqual(len(self.bst), len(bst2)) self.assertEqual(list(self.bst.traverse()), list(bst2)) self.assertEqual(self.bst.is_valid(), True) # ____10___ # / \ # 3__ _14 # \ / # 7 13 # / # 4 self.bst.delete(6) bst2.delete(6) self.assertEqual(len(self.bst), len(bst2)) self.assertEqual(list(self.bst.traverse()), list(bst2)) self.assertEqual(self.bst.is_valid(), True) self.bst.delete(10) self.bst.delete(4) self.bst.delete(7) self.bst.delete(14) self.bst.delete(3) self.bst.delete(13) self.assertEqual(len(self.bst), 0) self.assertFalse(self.bst) self.assertEqual(self.bst.is_valid(), True) def test_inorder_traverse(self): items = list(self.bst.inorder_traverse()) expected = [1, 3, 4, 6, 7, 8, 10, 13, 14] self.assertEqual(items, expected) items = list(self.bst.inorder_traverse(self.bst.root.right.left)) expected = [] self.assertEqual(items, expected) def test_preorder_traverse(self): items = list(self.bst.preorder_traverse()) expected = [8, 3, 1, 6, 4, 7, 10, 14, 13] self.assertEqual(items, expected) def test_postorder_traverse(self): items = list(self.bst.postorder_traverse()) expected = [1, 4, 7, 6, 3, 13, 14, 10, 8] self.assertEqual(items, expected) def test_levelorder_traverse(self): items = list(self.bst.levelorder_traverse()) expected = [8, 3, 10, 1, 6, 14, 4, 7, 13] self.assertEqual(items, expected) def test_traverse(self): with self.assertRaises(ValueError): self.bst.traverse('NOT EXIST') def test_invert(self): self.empty_bst.invert() self.bst.invert() items = list(self.bst.levelorder_traverse()) expected = [8, 10, 3, 14, 6, 1, 13, 7, 4] self.assertEqual(items, expected) self.assertEqual(self.bst.is_valid(), False) def test_to_array_representation(self): array = self.empty_bst.to_array_representation() self.assertEqual(array, []) array = self.bst.to_array_representation() root = binarytree.build(array) self.assertEqual(array, root.values) def test_from_array_representation(self): array = binarytree.bst(height=random.randint(0, 9), is_perfect=random.choice([True, False])).values bst = BinarySearchTree.from_array_representation(array) self.assertEqual(array, bst.to_array_representation())