def test_creation(self):
n = _DSFNode(7)
self.assertTrue(n.is_root())
self.assertEqual(n.parent, n)
self.assertEqual(n.next, n)
self.assertEqual(n.rank, 0)
self.assertEqual(n.value, 7)
def test_str(self):
n = _DSFNode(39)
self.assertEqual("39", str(n))
def test_repr(self):
n = _DSFNode(31)
self.assertEqual("(value: 31, rank: 0, parent: self)", repr(n))
n.parent = "null"
self.assertEqual("(value: 31, rank: 0, parent: null)", repr(n))
def test_creation_custom_rank(self):
n = _DSFNode(9, 101)
self.assertEqual(n.rank, 101)