def test_insert_item_QNode_to_empty():
node1 = QNode(10, priority=0)
pqueue = PriorityQ()
pqueue.insert(node1)
assert len(pqueue) == 1
assert pqueue[0].val == 10
assert pqueue[0].priority == 0
def test_insert_item_QNode_to_empty():
node1 = QNode(10, priority=0)
pqueue = PriorityQ()
pqueue.insert(node1)
assert len(pqueue) == 1
assert pqueue[0].val == 10
assert pqueue[0].priority == 0
def test_insert_item_not_QNode_to_empty():
queue = PriorityQ()
queue.insert(50)
assert len(queue) == 1
assert queue[0].val == 50
assert queue[0].priority is None
def test_insert_item_not_QNode_to_empty():
queue = PriorityQ()
queue.insert(50)
assert len(queue) == 1
assert queue[0].val == 50
assert queue[0].priority is None
