def test_push_and_pop(self):
sut = LinkedList([1, 2])
sut.push(3)
self.assertEqual(len(sut), 3)
self.assertEqual(sut.pop(), 3)
self.assertEqual(sut.pop(), 2)
self.assertEqual(sut.pop(), 1)
self.assertEqual(len(sut), 0)
sut.push(4)
self.assertEqual(len(sut), 1)
self.assertEqual(sut.head().value(), 4)
def test_push_and_pop(self):
sut = LinkedList([1, 2])
sut.push(3)
self.assertEqual(len(sut), 3)
self.assertEqual(sut.pop(), 3)
self.assertEqual(sut.pop(), 2)
self.assertEqual(sut.pop(), 1)
self.assertEqual(len(sut), 0)
sut.push(4)
self.assertEqual(len(sut), 1)
self.assertEqual(sut.head().value(), 4)
def test_pop_from_singleton_list_removes_head(self):
sut = LinkedList([1])
self.assertEqual(sut.pop(), 1)
with self.assertRaises(EmptyListException) as err:
sut.head()
self.assertEqual(type(err.exception), EmptyListException)
self.assertEqual(err.exception.args[0], "The list is empty.")
def test_error_on_empty_list_pop(self):
sut = LinkedList()
with self.assertRaisesWithMessage(EmptyListException):
sut.pop()
def test_pop_from_singleton_list_removes_head(self):
sut = LinkedList([1])
self.assertEqual(sut.pop(), 1)
with self.assertRaisesWithMessage(EmptyListException):
sut.head()
def test_can_pop_from_non_empty_list(self):
sut = LinkedList([3, 4, 5])
self.assertEqual(sut.pop(), 5)
self.assertEqual(len(sut), 2)
self.assertEqual(sut.head().value(), 4)
def test_error_on_empty_list_pop(self):
sut = LinkedList()
with self.assertRaisesWithMessage(EmptyListException):
sut.pop()
def test_pop_from_singleton_list_removes_head(self):
sut = LinkedList([1])
self.assertEqual(sut.pop(), 1)
with self.assertRaisesWithMessage(EmptyListException):
sut.head()
def test_can_from_non_empty_list(self):
sut = LinkedList([3, 4, 5])
self.assertEqual(sut.pop(), 5)
self.assertEqual(len(sut), 2)
self.assertEqual(sut.head().value(), 4)
def test_error_on_empty_list_pop(self):
sut = LinkedList()
with self.assertRaises(EmptyListException) as err:
sut.pop()
self.assertEqual(type(err.exception), EmptyListException)
self.assertEqual(err.exception.args[0], "The list is empty.")
