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: helper_macro.rs
    path of file: ./repos/handlebars-rust/tests
    
    the code of the file until where you have to start completion: #[macro_use]
extern crate handlebars;
#[macro_use]
extern crate serde_json;

use handlebars::Handlebars;
use time::format_description::{parse, well_known::Rfc2822};
use time::OffsetDateTime;

handlebars_helper!(lower: |s: str| s.to_lowercase());
handlebars_helper!(upper: |s: str| s.to_uppercase());
handlebars_helper!(hex: |v: i64| format!("0x{:x}", v));
handlebars_helper!(money: |v: i64, {cur: str="$"}| format!("{}{}.00", cur, v));
handlebars_helper!(all_hash: |{cur: str="$"}| cur);
handlebars_helper!(nargs: |*args| args.len());
handlebars_helper!(has_a: |{a:i64 = 99}, **kwargs|
                   format!("{}, {}", a, kwargs.get("a").is_some()));
handlebars_helper!(tag: |t: str| format!("<{}>", t));
handlebars_helper!(date: |dt: OffsetDateTime| dt.format(&parse("[year]-[month]-[day]").unwrap()).unwrap());

#[test]
fn test_macro_helper() {
    let mut hbs = Handlebars::new();

    hbs.register_helper("lower", Box::new(lower));
    hbs.register_helper("upper", Box::new(upper));
    hbs.register_helper("hex", Box::new(hex));
    hbs.register_helper("money", Box::new(money));
    hbs.registe
    
fn test_macro_helper() {
    let mut hbs = Handlebars::new();

    hbs.register_helper("lower", Box::new(lower));
    hbs.register_helper("upper", Box::new(upper));
    hbs.register_helper("hex", Box::new(hex));
    hbs.register_helper("money", Box::new(money));
    hbs.register_helper("nargs", Box::new(nargs));
    hbs.register_helper("has_a", Box::new(has_a));
    hbs.register_helper("tag", Box::new(tag));
    hbs.register_helper("date", Box::new(date));

    let data = json!("Teixeira");

    assert_eq!(
        hbs.render_template("{{lower this}}", &data).unwrap(),
        "teixeira"
    );
    assert_eq!(
        hbs.render_template("{{upper this}}", &data).unwrap(),
        "TEIXEIRA"
    );
    assert_eq!(hbs.render_template("{{hex 16}}", &()).unwrap(), "0x10");

    assert_eq!(
        hbs.render_template("{{money 5000}}", &()).unwrap(),
        "$5000.00"
    );
    assert_eq!(
        hbs.render_template("{{money 5000 cur=\"£\"}}", &())
            .unwrap(),
        "£5000.00"
    );
    assert_eq!(
        hbs.render_template("{{nargs 1 1 1 1 1}}", &()).unwrap(),
        "5"
    );
    assert_eq!(hbs.render_template("{{nargs}}", &()).unwrap(), "0");

    assert_eq!(
        hbs.render_template("{{has_a a=1 b=2}}", &()).unwrap(),
        "1, true"
    );

    assert_eq!(
        hbs.render_template("{{has_a x=1 b=2}}", &()).unwrap(),
        "99, false"
    );

    assert_eq!(
        hbs.render_template("{{tag \"html\"}}", &()).unwrap(),
        "&lt;html&gt;"
    );

    assert_eq!(
        hbs.render_template("{{{tag \"html\"}}}", &()).unwrap(),
        "<html>"
    );

    assert_eq!(
        hbs.render_template(
            "{{date this}}",
            &OffsetDateTime::parse("Wed, 18 Feb 2015 23:16:09 GMT", &Rfc2822).unwrap()
        )
        .unwrap(),
        "2015-02-18"
    );

    assert_eq!(
        hbs.render_template("{{eq image.link null}}", &json!({"image": {"link": null}}))
            .unwrap(),
        "true"
    );

    assert_eq!(
        hbs.render_template(
            "{{eq image.link null}}",
            &json!({"image": {"link": "https://url"}})
        )
        .unwrap(),
        "false"
    );

    assert_eq!(
        hbs.render_template("{{tag 'html'}}", &()).unwrap(),
        "&lt;html&gt;"
    );
}