def test_recent_items_queue_update_and_pop():
ris = RecentItemStack(4)
items = [8, 2, 6, 4, 5, 7]
for item in items:
ris.push(item)
eq_(len(ris), 4)
for item in reversed(items[-4:]):
eq_(ris.pop(), item)
eq_(len(ris), 0)
def test_recent_items_size_zero():
ris = RecentItemStack(0)
eq_(list(ris), [])
ris.push(1)
eq_(list(ris), [])
eq_(ris.pop(), None)
def test_recent_items_pop_empty():
ris = RecentItemStack(4)
eq_(len(ris), 0)
assert ris.pop() is None