def test_contains_not_on_multipl(self):
q = PriorityQueue(items=[42, 7, 0, 25])
assert not q.contains(10)
def test_contains_not_on_single(self):
q = PriorityQueue(items=[7])
assert not q.contains(1)
def test_contains_on_multiple(self):
q = PriorityQueue(items=[42, 7, 0, 25])
assert q.contains(7)
def test_contains_on_empty(self):
q = PriorityQueue()
assert not q.contains(0)
