gecko-dev/third_party/rust/ron/tests/depth_limit.rs

use serde::Serialize;
use std::collections::HashMap;

#[derive(Serialize)]
struct Config {
    float: (f32, f64),
    tuple: TupleStruct,
    map: HashMap<u8, char>,
    nested: Nested,
    var: Variant,
    array: Vec<()>,
}

#[derive(Serialize)]
struct TupleStruct((), bool);

#[derive(Serialize)]
enum Variant {
    A(u8, &'static str),
}

#[derive(Serialize)]
struct Nested {
    a: String,
    b: char,
}

const EXPECTED: &str = "(
    float: (2.18,-1.1,),
    tuple: ((),false,),
    map: {8:'1',},
    nested: (a:\"a\",b:'b',),
    var: A(255,\"\",),
    array: [(),(),(),],
)";

#[test]
fn depth_limit() {
    let data = Config {
        float: (2.18, -1.1),
        tuple: TupleStruct((), false),
        map: vec![(8, '1')].into_iter().collect(),
        nested: Nested {
            a: "a".to_owned(),
            b: 'b',
        },
        var: Variant::A(!0, ""),
        array: vec![(); 3],
    };

    let pretty = ron::ser::PrettyConfig {
        depth_limit: 2,
        separate_tuple_members: true,
        enumerate_arrays: true,
        ..Default::default()
    };
    let s = ron::ser::to_string_pretty(&data, pretty);

    assert_eq!(s, Ok(EXPECTED.to_string()));
}