Method set

tests/common/mod.rs:34–38

(key: &'static str, value: impl AsRef<OsStr>)

impl EnvVarGuard {
    pub fn set(key: &'static str, value: impl AsRef<OsStr>) -> Self {
        let previous = std::env::var_os(key);
        std::env::set_var(key, value);
        Self { key, previous }
    }

    /// Removes `key` for the guard's lifetime, so tests can exercise the
    /// no-override path.