rootLocaleFormat(
                  "%s.%s() must return an array of %s.",
                  annotationClass, propertyName, annotationClass.getDeclaringClass()))
          .that(returnType.getComponentType())
          .isEqualTo(annotationClass.getDeclaringClass());
    }
  }

  // This is public so that tests for Feature enums we haven't yet imagined
  // can reuse it.