import pytest def test_add_by_two_empty_list(): assert add_by_two([]) == [] def test_add_by_two_single_element(): assert add_by_two([1]) == [3] def test_add_by_two_positive_numbers(): assert add_by_two([1, 2, 3, 4, 5]) == [3, 4, 5, 6, 7] def test_add_by_two_negative_numbers(): assert add_by_two([-1, -2, -3, -4, -5]) == [1, 0, -1, -2, -3] def test_add_by_two_mixed_numbers(): assert add_by_two([-1, 0, 1, 2, 3]) == [1, 2, 3, 4, 5] def test_add_by_two_empty_string(): assert add_by_two([""]) == TypeError def test_add_by_two_strings(): assert add_by_two(["Hello", "World"]) == TypeError