def test_pq_pop_when_empty():
"""Ensures that an exception is raised when trying
to pop() from an empty priority heap.
"""
pq = PriorityQueue()
with pytest.raises(IndexError):
pq.pop()
def test_pop_single(create_pq):
pq = PriorityQueue()
pq.insert(1, "Almost missed this")
assert pq.pop() == "Almost missed this"
