def test_deletion2(self):
test = Tree(9)
test.insert(33)
test.insert(56)
self.assertTrue(test.delete_node(test, 9), 0)
def test_deletion(self):
sample = Tree(14)
sample.insert(2)
sample.insert(56)
self.assertNotEqual(sample.delete_node(sample, 56), 0)
