def test_reversed_via_str_non_empty(self):
dl = DoublyLinkedList.from_iterable(range(4))
actual = io.StringIO()
with redirect_stdout(actual):
print(DoublyLinkedList.from_iterable(reversed(dl)), end='')
expected = 'DoublyLinkedList(3 <-> 2 <-> 1 <-> 0)'
self.assertEqual(actual.getvalue(), expected)
def test_str_non_empty(self):
dl = DoublyLinkedList.from_iterable([1, 2, 3])
actual = io.StringIO()
with redirect_stdout(actual):
print(dl, end='')
expected = 'DoublyLinkedList(1 <-> 2 <-> 3)'
self.assertEqual(actual.getvalue(), expected)
def test_type(self):
self.assertIsInstance(DoublyLinkedList(), DoublyLinkedList)
def test_equality_empty(self):
dl1 = DoublyLinkedList()
dl2 = DoublyLinkedList()
self.assertTrue(dl1 == dl2)
def test_equality(self):
dl1 = DoublyLinkedList.from_iterable(range(4))
dl2 = DoublyLinkedList.from_iterable([0, 1, 2, 3])
self.assertTrue(dl1 == dl2)
def test_truthfulness_1(self):
dl = DoublyLinkedList.from_iterable([-1])
self.assertTrue(dl)
def test_truthfulness_2(self):
dl = DoublyLinkedList.from_iterable([1, 2, 5, 8, 9])
self.assertTrue(dl)
def test_truthfulness_empty_container(self):
dl = DoublyLinkedList.from_iterable([])
self.assertFalse(dl)
def test_from_iterable_2(self):
dl = DoublyLinkedList.from_iterable([1, 2, 5, 8, 9])
self.assertEqual(len(dl), 5)
def test_from_iterable_1(self):
dl = DoublyLinkedList.from_iterable([1])
self.assertEqual(len(dl), 1)
def test_from_iterable_empty(self):
dl = DoublyLinkedList.from_iterable([])
self.assertEqual(len(dl), 0)
def test_len_0(self):
self.assertEqual(len(DoublyLinkedList()), 0)