before using uselog_rs, you must use four lines code to use log for outputing log in test mode and not test mode
#[cfg(not(test))]
use log::{debug, info, warn};
#[cfg(test)]
use std::{println as debug, println as info, println as warn};
now just one line code
uselog!(debug, info, warn)
but you need to add uselog_rs to your parent module first like
#[macro_use(uselog)]
extern crate uselog_rs;