def test_simple(self):
node = AVLNode(1)
node.weight = 2
node.right = AVLNode(2)
node.right.weight = 1
node.right.right = AVLNode(3)
new = node.rotate_left()
self.assertEqual(2, new.key)
self.assertEqual(0, new.weight)
self.assertEqual(0, node.weight)
self.assertTrue(new.is_valid())
def test_left(self):
node = AVLNode(2)
node.left = AVLNode(1)
node.weight = 1
node.right = AVLNode(4)
node.right.weight = -1
node.right.left = AVLNode(3)
new = node.rotate_left()
self.assertEqual(4, new.key)
self.assertEqual(node, new.left)
self.assertEqual(0, node.weight)
self.assertEqual(-2, new.weight)
self.assertFalse(new.is_valid())
def test_normal(self):
node = AVLNode(4)
node.weight = -1
node.left = AVLNode(2)
node.right = AVLNode(5)
node.left.left = AVLNode(1)
node.left.right = AVLNode(3)
new = node.rotate_right()
self.assertEqual(2, new.key)
self.assertEqual(node, new.right)
self.assertEqual(1, new.weight)
self.assertEqual(0, node.weight)
self.assertTrue(new.is_valid())
def test_right(self):
node = AVLNode(2)
node.left = AVLNode(1)
node.weight = 1
node.right = AVLNode(3)
node.right.weight = 1
node.right.right = AVLNode(4)
new = node.rotate_left()
self.assertEqual(3, new.key)
self.assertEqual(node, new.left)
self.assertEqual(None, node.right)
self.assertEqual(-1, node.weight)
self.assertEqual(-1, new.weight)
self.assertTrue(new.is_valid())