use log::*; #[test] fn you_must_see_exactly_three_messages_above_1_err_1_warn_1_info() { flexi_logger::Logger::try_with_str("info") .unwrap() .start() .unwrap(); error!("This is an error message"); warn!("This is a warning"); info!("This is an info message"); debug!("This is a debug message - you must not see it!"); trace!("This is a trace message - you must not see it!"); }