src/test/ui/custom_test_frameworks/auxiliary/example_runner.rs

   1 pub trait Testable {
   2     fn name(&self) -> String;
   3     fn run(&self) -> Option<String>; // None will be success, Some is the error message
   4 }
   5
   6 pub fn runner(tests: &[&dyn Testable]) {
   7     for t in tests {
   8         print!("{}........{}", t.name(), t.run().unwrap_or_else(|| "SUCCESS".to_string()));
   9     }
  10 }