def test_new_left(self):
root = Node()
root.set_root()
left = root.new_left()
self.assertTrue(root.has_left())
self.assertFalse(root.has_right())
self.assertEqual(root.left, left)
self.assertEqual(left.parent, root)
self.assertFalse(root.is_leaf())
self.assertFalse(left.is_root())
self.assertTrue(left.is_leaf())
self.assertEqual('left', left.position)
def test_new_right(self):
root = Node()
root.set_root()
right = root.new_right()
self.assertTrue(root.has_right())
self.assertFalse(root.has_left())
self.assertEqual(root.right, right)
self.assertEqual(right.parent, root)
self.assertFalse(root.is_leaf())
self.assertFalse(right.is_root())
self.assertTrue(right.is_leaf())
self.assertEqual('right', right.position)
