serde_urlencoded 0.7.1: serde_urlencoded::from_str, serde_urlencoded::to_string

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Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/serde_urlencoded@0.7.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/serde_urlencoded@0.7.1
Demonstrate these symbols/APIs:
  - serde_urlencoded::from_str
  - serde_urlencoded::to_string

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

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  "goal": "verify pkg:cargo/serde_urlencoded@0.7.1",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/serde_urlencoded@0.7.1"
  ],
  "symbols": [
    "serde_urlencoded::from_str",
    "serde_urlencoded::to_string"
  ]
}

//! Clean-room verification sample for serde_urlencoded.

pub use serde_urlencoded::*;

use serde_urlencoded::{from_str, to_string};

fn main() {
    // 1. to_string serializes sequence of key-value pairs to URL-encoded query string
    let params = &[("name", "alice"), ("role", "admin")];
    let encoded = to_string(params).expect("failed to serialize params");
    assert_eq!(encoded, "name=alice&role=admin");

    // 2. to_string percent-encodes special characters and spaces
    let special = &[("query", "hello world!"), ("tag", "a&b=c")];
    let encoded_special = to_string(special).expect("failed to serialize special chars");
    assert_eq!(encoded_special, "query=hello+world%21&tag=a%26b%3Dc");

    // 3. from_str deserializes URL-encoded query string into sequence of key-value pairs
    let input = "user=bob&status=active";
    let decoded: Vec<(String, String)> = from_str(input).expect("failed to deserialize");
    assert_eq!(
        decoded,
        vec![
            ("user".to_string(), "bob".to_string()),
            ("status".to_string(), "active".to_string()),
        ]
    );

    // 4. from_str decodes percent-encoded characters and plus signs
    let encoded_input = "city=New+York&greeting=hello%20world";
    let decoded_special: Vec<(String, String)> =
        from_str(encoded_input).expect("failed to deserialize special");
    assert_eq!(
        decoded_special,
        vec![
            ("city".to_string(), "New York".to_string()),
            ("greeting".to_string(), "hello world".to_string()),
        ]
    );

    // 5. from_str returns error when value cannot be parsed into target type
    let invalid_int = "id=not_an_int";
    let err = from_str::<Vec<(String, u32)>>(invalid_int);
    assert!(err.is_err());

    println!("All serde_urlencoded contract assertions passed successfully.");
}