def test_SpecifyThatAnItemCanBeInserted(self):
# arrange
priorityQueue = PriorityQueue()
# act
priorityQueue.Insert(4)
# assert
self.assertEqual(priorityQueue.IsEmpty(), False)
self.assertEqual(priorityQueue._items[0], 4)
def test_SpecifyThatFirstItemInQueueCanBeSeen(self):
# arrange
priorityQueue = PriorityQueue()
# act
priorityQueue.Insert(4)
priorityQueue.Insert(5)
priorityQueue.Insert(8)
priorityQueue.Insert(1)
priorityQueue.Insert(3)
# assert
self.assertEqual(priorityQueue.IsEmpty(), False)
self.assertEqual(len(priorityQueue._items), 5)
self.assertEqual(priorityQueue.Peek(), 1)
def test_SpecifyThatFirstItemCanBeRetrievedFromTheQueue(self):
# arrange
priorityQueue = PriorityQueue()
# act
priorityQueue.Insert(4)
priorityQueue.Insert(5)
priorityQueue.Insert(8)
priorityQueue.Insert(1)
priorityQueue.Insert(3)
# assert
self.assertEqual(priorityQueue.IsEmpty(), False)
self.assertEqual(len(priorityQueue._items), 5)
self.assertEqual(priorityQueue.Pop(), 1)
self.assertEqual(len(priorityQueue._items), 4)
def test_SpecifyThatPriorityDoesNotContainDuplicates(self):
# arrange
priorityQueue = PriorityQueue()
# act
priorityQueue.Insert(4)
priorityQueue.Insert(3)
priorityQueue.Insert(4)
priorityQueue.Insert(1)
priorityQueue.Insert(3)
# assert
self.assertEqual(priorityQueue.IsEmpty(), False)
self.assertEqual(len(priorityQueue._items), 3)
self.assertEqual(priorityQueue._items[0], 4)
self.assertEqual(priorityQueue._items[1], 3)
self.assertEqual(priorityQueue._items[2], 1)
def test_SpecifyThatMultipleItemsCanBeInsertedAndOrdered(self):
# arrange
priorityQueue = PriorityQueue()
# act
priorityQueue.Insert(4)
priorityQueue.Insert(5)
priorityQueue.Insert(8)
priorityQueue.Insert(1)
priorityQueue.Insert(3)
# assert
self.assertEqual(priorityQueue.IsEmpty(), False)
self.assertEqual(len(priorityQueue._items), 5)
self.assertEqual(priorityQueue._items[0], 8)
self.assertEqual(priorityQueue._items[1], 5)
self.assertEqual(priorityQueue._items[2], 4)
self.assertEqual(priorityQueue._items[3], 3)
self.assertEqual(priorityQueue._items[4], 1)
def test_SpecifyThatItCanBeDeterminedIfTheQueueIsEmpty(self):
# arrange
priorityQueue = PriorityQueue()
# assert
self.assertEqual(priorityQueue.IsEmpty(), True)