netsuke-build 0.1.0-beta3

A YAML-powered Ninja/Jinja hybrid build system.
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//! Shared test doubles for CLI configuration tests.
//!
//! `TestEnv` provides deterministic, in-memory environment values for unit
//! tests that exercise [`super::discovery::EnvProvider`] without mutating the
//! process environment.

use std::{collections::HashMap, ffi::OsString};

use super::discovery::EnvProvider;

/// In-memory environment values for deterministic CLI configuration tests.
#[derive(Default)]
pub(crate) struct TestEnv {
    values: HashMap<&'static str, OsString>,
}

impl TestEnv {
    /// Add one environment value to this test double.
    pub(crate) fn with_var(mut self, name: &'static str, value: impl Into<OsString>) -> Self {
        self.values.insert(name, value.into());
        self
    }
}

impl EnvProvider for TestEnv {
    fn get(&self, key: &str) -> Option<OsString> {
        self.values.get(key).cloned()
    }

    fn entries(&self) -> Vec<(OsString, OsString)> {
        self.values
            .iter()
            .map(|(key, value)| (OsString::from(*key), value.clone()))
            .collect()
    }
}