def test_is_empty(self):
s = test_items_seq()
tree = AnderssonTree()
self.assertTrue(tree.is_empty())
tree.update(s)
self.assertFalse(tree.is_empty())
tree.clear()
self.assertTrue(tree.is_empty())
def test_clear(self):
s = test_items_seq()
tree = AnderssonTree(s)
self.check_aatree_properties(tree)
tree.clear()
self.assertEqual(len(tree), 0)
