figment 0.10.19

A configuration library so con-free, it's unreal.
Documentation 
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use figment::{Figment, providers::Env};

#[derive(serde::Deserialize)]
struct Config {
    foo: String
}

#[test]
fn empty_env_vars() {
    figment::Jail::expect_with(|jail| {
        jail.set_env("FOO", "bar");
        jail.set_env("BAZ", "put");

        let config = Figment::new()
            .merge(Env::raw().map(|_| "".into()))
            .extract::<Config>();

        assert!(config.is_err());

        let config = Figment::new()
            .merge(Env::raw().map(|_| "   ".into()))
            .extract::<Config>();

        assert!(config.is_err());

        let config = Figment::new()
            .merge(Env::raw().map(|k| {
                if k == "foo" { k.into() }
                else { "".into() }
            }))
            .extract::<Config>()?;

        assert_eq!(config.foo, "bar");

        let config = Figment::new()
            .merge(Env::raw().map(|k| {
                if k == "foo" { "   foo   ".into() }
                else { "".into() }
            }))
            .extract::<Config>()?;

        assert_eq!(config.foo, "bar");

        jail.set_env("___foo", "is here");
        let config = Figment::new()
            .merge(Env::raw().split("_"))
            .extract::<Config>()?;

        assert_eq!(config.foo, "bar");

        jail.set_env("foo__", "is here");
        let config = Figment::new()
            .merge(Env::raw().split("_"))
            .extract::<Config>()?;

        assert_eq!(config.foo, "bar");

        Ok(())
    });
}