def test_peek_fail():
"""Test peek function on empty queue."""
from priority import Priority
new_p_q = Priority()
with pytest.raises(IndexError):
new_p_q.peek()
def test_peek():
"""Test peek function on populated queue."""
from priority import Priority
new_p_q = Priority([("monkey", 1), ("cat", 2), ("dog", 1)])
assert new_p_q.peek() == ("monkey")