def test_pop(self):
heap = RemovalHeap(reversed(ascii_uppercase))
sorted_items = []
for c in ascii_uppercase:
popped_item = heap.pop()
heap.check()
self.assertEqual(c, popped_item)
sorted_items.append(popped_item)
self.assertSequenceEqual(ascii_uppercase, sorted_items)
self.assertSetEqual(set(), set(heap))
