def not_found_test(): assert_equal(find_last(positive, []), None)
def find_last_nocurry_test(): assert_equal(find_last(positive, [-2, -1, 0, 1, 2, -2]), 2)
def test_find_last_curry(): assert_equal(find_last(positive)([-2, -1, 0, 1, 2, -1, -2]), 2)