tests/merge.rs

#![cfg(feature = "toml")]

use config::{Config, File, FileFormat, Map};

fn make() -> Config {
    Config::builder()
        .add_source(File::new("tests/Settings", FileFormat::Toml))
        .add_source(File::new("tests/Settings-production", FileFormat::Toml))
        .build()
        .unwrap()
}

#[test]
fn test_merge() {
    let c = make();

    assert_eq!(c.get("debug").ok(), Some(false));
    assert_eq!(c.get("production").ok(), Some(true));
    assert_eq!(c.get("place.rating").ok(), Some(4.9));

    if cfg!(feature = "preserve_order") {
        let m: Map<String, String> = c.get("place.creator").unwrap();
        assert_eq!(
            m.into_iter().collect::<Vec<(String, String)>>(),
            vec![
                ("name".to_string(), "Somebody New".to_string()),
                ("username".to_string(), "jsmith".to_string()),
                ("email".to_string(), "jsmith@localhost".to_string()),
            ]
        );
    } else {
        assert_eq!(
            c.get("place.creator.name").ok(),
            Some("Somebody New".to_string())
        );
    }
}

#[test]
fn test_merge_whole_config() {
    let builder1 = Config::builder().set_override("x", 10).unwrap();
    let builder2 = Config::builder().set_override("y", 25).unwrap();

    let config1 = builder1.build_cloned().unwrap();
    let config2 = builder2.build_cloned().unwrap();

    assert_eq!(config1.get("x").ok(), Some(10));
    assert_eq!(config2.get::<()>("x").ok(), None);

    assert_eq!(config2.get("y").ok(), Some(25));
    assert_eq!(config1.get::<()>("y").ok(), None);

    let config3 = builder1.add_source(config2).build().unwrap();

    assert_eq!(config3.get("x").ok(), Some(10));
    assert_eq!(config3.get("y").ok(), Some(25));
}