config 0.13.4

Layered configuration system for Rust applications.
Documentation 
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use config::Config;

#[test]
fn wrapping_u16() {
    let c = Config::builder()
        .add_source(config::File::from_str(
            r#"
            [settings]
            port = 66000
            "#,
            config::FileFormat::Toml,
        ))
        .build()
        .unwrap();

    let port: u16 = c.get("settings.port").unwrap();
    assert_eq!(port, 464);
}

#[test]
fn nonwrapping_u32() {
    let c = Config::builder()
        .add_source(config::File::from_str(
            r#"
            [settings]
            port = 66000
            "#,
            config::FileFormat::Toml,
        ))
        .build()
        .unwrap();

    let port: u32 = c.get("settings.port").unwrap();
    assert_eq!(port, 66000);
}

#[test]
#[should_panic]
fn invalid_signedness() {
    let c = Config::builder()
        .add_source(config::File::from_str(
            r#"
            [settings]
            port = -1
            "#,
            config::FileFormat::Toml,
        ))
        .build()
        .unwrap();

    let _: u32 = c.get("settings.port").unwrap();
}