def test_is_empty(self):
lifo = LIFOQueue()
self.assertTrue(lifo.is_empty(), "New queue should be empty")
lifo.add(1)
self.assertFalse(lifo.is_empty(), "Queue with added element shouldn't be empty")
lifo.pop()
self.assertTrue(lifo.is_empty(), "When all elements removed from a queue it should be empty")
def test_pop_add(self):
lifo = LIFOQueue()
lifo.add(1)
lifo.add(2)
lifo.add(3)
self.assertEqual(3, lifo.length())
self.assertEqual(3, lifo.pop())
self.assertEqual(2, lifo.pop())
self.assertEqual(1, lifo.pop())
def test_pop_add(self):
lifo = LIFOQueue()
lifo.add(1)
lifo.add(2)
lifo.add(3)
self.assertEqual(3, lifo.length())
self.assertEqual(3, lifo.pop())
self.assertEqual(2, lifo.pop())
self.assertEqual(1, lifo.pop())
def test_is_empty(self):
lifo = LIFOQueue()
self.assertTrue(lifo.is_empty(), "New queue should be empty")
lifo.add(1)
self.assertFalse(lifo.is_empty(),
"Queue with added element shouldn't be empty")
lifo.pop()
self.assertTrue(
lifo.is_empty(),
"When all elements removed from a queue it should be empty")
def test_remove(self):
lifo = LIFOQueue()
lifo.add(1)
lifo.add(2)
lifo.add(3)
self.assertFalse(lifo.remove(5))
self.assertTrue(lifo.remove(2))
self.assertEqual(2, lifo.length())
self.assertEqual(3, lifo.pop())
self.assertEqual(1, lifo.pop())
def test_remove(self):
lifo = LIFOQueue()
lifo.add(1)
lifo.add(2)
lifo.add(3)
self.assertFalse(lifo.remove(5))
self.assertTrue(lifo.remove(2))
self.assertEqual(2, lifo.length())
self.assertEqual(3, lifo.pop())
self.assertEqual(1, lifo.pop())