vendor/yaml-rust-0.4.5/tests/test_round_trip.rs

extern crate yaml_rust;

use yaml_rust::{Yaml, YamlEmitter, YamlLoader};

fn roundtrip(original: &Yaml) {
    let mut emitted = String::new();
    YamlEmitter::new(&mut emitted).dump(original).unwrap();

    let documents = YamlLoader::load_from_str(&emitted).unwrap();
    println!("emitted {}", emitted);

    assert_eq!(documents.len(), 1);
    assert_eq!(documents[0], *original);
}

fn double_roundtrip(original: &str) {
    let parsed = YamlLoader::load_from_str(&original).unwrap();

    let mut serialized = String::new();
    YamlEmitter::new(&mut serialized).dump(&parsed[0]).unwrap();

    let reparsed = YamlLoader::load_from_str(&serialized).unwrap();

    assert_eq!(parsed, reparsed);
}

#[test]
fn test_escape_character() {
    let y = Yaml::String("\x1b".to_owned());
    roundtrip(&y);
}

#[test]
fn test_colon_in_string() {
    let y = Yaml::String("x: %".to_owned());
    roundtrip(&y);
}

#[test]
fn test_numberlike_strings() {
    let docs = [
        r#"x: "1234""#, r#"x: "01234""#, r#""1234""#,
        r#""01234""#, r#"" 01234""#, r#""0x1234""#,
        r#"" 0x1234""#,
    ];

    for doc in &docs {
        roundtrip(&Yaml::String(doc.to_string()));
        double_roundtrip(&doc);
    }
}

/// Example from https://github.com/chyh1990/yaml-rust/issues/133
#[test]
fn test_issue133() {

    let doc = YamlLoader::load_from_str("\"0x123\"").unwrap().pop().unwrap();
    assert_eq!(doc, Yaml::String("0x123".to_string()));

    let mut out_str = String::new();
    YamlEmitter::new(&mut out_str).dump(&doc).unwrap();
    let doc2 = YamlLoader::load_from_str(&out_str).unwrap().pop().unwrap();
    assert_eq!(doc, doc2); // This failed because the type has changed to a number now

}