def test_update_node_count(self):
node_5 = Node(5)
node_0 = Node(0)
node_12 = Node(12)
tree = AVL(node_5)
tree._set_root(node_5)
node_5.set_left_child(node_0)
node_5.set_right_child(node_12)
node_0.set_parent(node_5)
node_12.set_parent(node_5)
node_5.set_node_count(2)
node_6 = Node(6)
node_12.set_left_child(node_6)
node_6.set_parent(node_12)
tree._update_node_counts(node_6)
expect(node_5.get_node_count()).to.be.equal(4)
expect(node_0.get_node_count()).to.be.equal(1)
expect(node_12.get_node_count()).to.be.equal(2)
expect(node_6.get_node_count()).to.be.equal(1)
def test_rotate_right_subtree_is_right_child_from_root(self):
A = create_right_rotable_tree()
root = Node(10, name='root')
root.set_right_child(A)
A.set_parent(root)
root._set_height(3)
rotable_to_right_tree = AVL(root)
rotable_to_right_tree._right_rotate(
rotable_to_right_tree.get_root().get_right_child())
root = rotable_to_right_tree.get_root()
B = root.get_right_child()
A = B.get_right_child()
a = B.get_left_child()
c = A.get_right_child()
b = A.get_left_child()
expect(root.get_name()).to.be.equal('root')
expect(B.get_name()).to.be.equal('B')
expect(A.get_name()).to.be.equal('A')
expect(a.get_name()).to.be.equal('a')
expect(b.get_name()).to.be.equal('b')
expect(c.get_name()).to.be.equal('c')
expect(root.get_height()).to.be.equal(3)
expect(B.get_height()).to.be.equal(2)
expect(A.get_height()).to.be.equal(1)
expect(a.get_height()).to.be.equal(0)
expect(b.get_height()).to.be.equal(0)
expect(c.get_height()).to.be.equal(0)
expect(root.get_node_count()).to.be.equal(6)
expect(B.get_node_count()).to.be.equal(5)
expect(A.get_node_count()).to.be.equal(3)
expect(a.get_node_count()).to.be.equal(1)
expect(b.get_node_count()).to.be.equal(1)
expect(c.get_node_count()).to.be.equal(1)