Function run_at 

pub fn run_at<W: Write>(
    out: &mut W,
    args: &AuthArgs,
    path: &Path,
) -> Result<Exit>

run_to, against a named store.

The path is a parameter for the same reason init::run_with takes one: the store is user-level state, and a test using the real one would read and write the developer’s own keys.