serde_with 1.13.0

Custom de/serialization functions for Rust's serde
Documentation 
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mod utils;

use crate::utils::is_equal;
use expect_test::expect;
use serde::{Deserialize, Serialize};
use serde_with::json::JsonString;
use serde_with::{serde_as, DisplayFromStr};

#[test]
fn test_nested_json() {
    #[serde_as]
    #[derive(Debug, Serialize, Deserialize, PartialEq)]
    struct Struct {
        #[serde_as(as = "JsonString")]
        value: Nested,
    }

    #[serde_as]
    #[derive(Debug, Serialize, Deserialize, PartialEq)]
    struct Nested {
        #[serde_as(as = "DisplayFromStr")]
        value: u32,
    }

    is_equal(
        Struct {
            value: Nested { value: 444 },
        },
        expect![[r#"
            {
              "value": "{\"value\":\"444\"}"
            }"#]],
    );
}