def test_if_shift_needs_no_inputs():
"""Test that an unnecessary parameter will raise a TypeError."""
import pytest
from doubly_linked_list import DLinkedList
test_dlinked_list = DLinkedList()
test_dlinked_list.push(5)
test_dlinked_list.push(7)
test_dlinked_list.push(10)
with pytest.raises(TypeError):
test_dlinked_list.shift(5)
def test_output_of_shift_exists():
"""Test that the output exists."""
from doubly_linked_list import DLinkedList
test_dlinked_list = DLinkedList()
test_dlinked_list.push(5)
test_dlinked_list.push(7)
test_dlinked_list.push(10)
assert test_dlinked_list.shift() is not None