You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/pgrx/pgrx-examples/spi_srf/src
    
    the code of the file until where you have to start completion: //LICENSE Portions Copyright 2019-2021 ZomboDB, LLC.
//LICENSE
//LICENSE Portions Copyright 2021-2023 Technology Concepts & Design, Inc.
//LICENSE
//LICENSE Portions Copyright 2023-2023 PgCentral Foundation, Inc. <contact@pgcentral.org>
//LICENSE
//LICENSE All rights reserved.
//LICENSE
//LICENSE Use of this source code is governed by the MIT license that can be found in the LICENSE file.
use pgrx::prelude::*;
use pgrx::IntoDatum;

::pgrx::pg_module_magic!();

extension_sql!(
    r#"

CREATE TABLE dog_daycare (
    dog_name varchar(256),
    dog_age int,
    dog_breed varchar(256)
);

INSERT INTO dog_daycare(dog_name, dog_age, dog_breed) VALUES ('Fido', 3, 'Labrador');
INSERT INTO dog_daycare(dog_name, dog_age, dog_breed) VALUES ('Spot', 5, 'Poodle');
INSERT INTO d
    
    fn test_calculate_human_years() -> Result<(), pgrx::spi::Error> {
        let mut results: Vec<(Result<Option<String>, _>, i32, Result<Option<String>, _>, i32)> =
            Vec::new();

        results.push((Ok(Some("Fido".to_string())), 3, Ok(Some("Labrador".to_string())), 21));
        results.push((Ok(Some("Spot".to_string())), 5, Ok(Some("Poodle".to_string())), 35));
        results.push((Ok(Some("Rover".to_string())), 7, Ok(Some("Golden Retriever".to_string())), 49));
        results.push((Ok(Some("Snoopy".to_string())), 9, Ok(Some("Beagle".to_string())), 63));
        results.push((Ok(Some("Lassie".to_string())), 11, Ok(Some("Collie".to_string())), 77));
        results.push((Ok(Some("Scooby".to_string())), 13, Ok(Some("Great Dane".to_string())), 91));
        results.push((Ok(Some("Moomba".to_string())), 15, Ok(Some("Labrador".to_string())), 105));
        let func_results = calculate_human_years()?;

        for (expected, actual) in results.iter().zip(func_results) {
            assert_eq!(expected, &actual);
        }
        Ok(())
    }