def test_delete_withExistingOperationInGivenTime_shouldDeleteOperationAndPropagateItsEffects(
self):
q = QueueFR()
# q = [enqueue(1), dequeue(), ..., enqueue(t), dequeue()]
# q will be an empty queue at the end of the loop
for t in range(1, 20):
q.enqueue(t, t)
q.dequeue(t + 0.5)
self.assertEqual(0, q.size())
self.assertIsNone(q.back())
self.assertIsNone(q.front())
# Deleting all dequeue operations
# q = [1, 2, ..., 19]
for t in range(1, 20):
q.delete(t + 0.5)
self.assertEqual(t, q.size())
self.assertEqual(19, q.back())
self.assertEqual(20 - t, q.front())
# Deleting all enqueue operations
# q = []
for t in range(1, 20):
q.delete(t)
self.assertEqual(19 - t, q.size())
if t == 19:
self.assertIsNone(q.back())
self.assertIsNone(q.front())
else:
self.assertEqual(19, q.back())
self.assertEqual(t + 1, q.front())
def test_back_withUpdatesInCurrentTime_shouldReturnCurrentBackOfQueue(
self):
q = QueueFR()
for i in range(1, 20):
q.enqueue(i, i)
self.assertEqual(i, q.back())
for i in range(1, 20):
q.dequeue(20 + i)
if i == 19:
self.assertIsNone(q.back())
else:
self.assertEqual(19, q.back())
def test_enqueue_withDifferentTimes_shouldEnqueueValueAtGivenTime(self):
q = QueueFR()
# Should behave as ephemeral queue
for t in range(20):
q.enqueue(t, t)
self.assertEqual(0, q.front())
self.assertEqual(t, q.back())
for t in range(1, 20):
q.enqueue(t + 0.5, t + 0.5)
self.assertEqual(0, q.front(t + 0.5))
self.assertEqual(t + 0.5, q.back(t + 0.5))
def test_back_withUpdatesInDifferentTimes_shouldReturnCorrectBackOfQueueAtGivenTime(
self):
q = QueueFR()
for t in range(20):
q.enqueue(t, t)
for t in range(20):
self.assertEqual(t, q.dequeue(t + 0.5))
self.assertIsNone(q.back(t + 0.5))
def test_constructor_shouldCreateEmptyQueue(self):
q = QueueFR()
self.assertEqual(0, q.size())
self.assertIsNone(q.back())
self.assertIsNone(q.front())
def test_back_withEmptyQueueAtGivenTimes_shouldReturnNone(self):
q = QueueFR()
self.assertIsNone(q.back())
for i in range(-20, 20):
self.assertIsNone(q.back(i))