| #[macro_export] |
| macro_rules! test { |
| ( |
| let mut $elem_ident:ident = $elem_expr:expr; |
| [ $($assert:tt)* ] => $msg:literal |
| ) => { |
| { |
| #[allow(unused_assignments, unused_mut, unused_variables)] |
| let rslt = std::panic::catch_unwind(|| { |
| let mut $elem_ident = $elem_expr; |
| assert!($($assert)*); |
| }); |
| let err = rslt.unwrap_err(); |
| if let Some(elem) = err.downcast_ref::<String>() { |
| assert_eq!(elem, &$msg); |
| } |
| else if let Some(elem) = err.downcast_ref::<&str>() { |
| assert_eq!(elem, &$msg); |
| } |
| else { |
| panic!("assert!( ... ) should return a string"); |
| } |
| } |
| } |
| } |
