def test_empty_instantiation_args():
    tpq = PriorityQ()
    with pytest.raises(IndexError):
        tpq.pop()
def test_empty_instantiation_args():
    tpq = PriorityQ()
    with pytest.raises(IndexError):
        tpq.pop()
def test_valid_instantiation_args(input):
    tpq = PriorityQ(input)
    assert tpq.pop() is not None
def test_valid_instantiation_args(input):
    tpq = PriorityQ(input)
    assert tpq.pop() is not None