def test_not_found(): assert_equal(find_last_index(positive, []), None)
def test_find_index_nocurry(): assert_equal(find_last_index(positive, [-2, -1, 0, 1, 2, -2]), 5)
def test_find_index_curry(): assert_equal(find_last_index(positive)([-2, -1, 0, 1, 2, -1]), 5)