use ::assure::*; fn equality(a: i32, b: i32) -> Result { assure_eq!(a, b, format!("error {} and {}", a, b))?; Ok(true) } #[test] fn test_x_return_err() { let a = 1; let b = 2; let x = equality(a, b); assert!(x.is_err()); assert_eq!( x.unwrap_err(), "error 1 and 2" ); }