code: protected void validatePublicVoidNoArgMethods(Class<? extends Annotation> annotation,
              boolean isStatic, List<Throwable> errors) {
          List<FrameworkMethod> methods = getTestClass().getAnnotatedMethods(annotation);
  
          for (FrameworkMethod eachTestMethod : methods) {
              eachTestMethod.validatePublicVoidNoArg(isStatic, errors);
          }
      }
docs: Adds to {@code errors} if any method in this class is annotated with
  {@code annotation}, but:
  <ul>
  <li>is not public, or
  <li>takes parameters, or
  <li>returns something other than void, or
  <li>is static (given {@code isStatic is false}), or
  <li>is not static (given {@code isStatic is true}).
  </ul>