anchor.diff:            permissionFuture,
             throwsA(
               isA<PermissionDefinitionsNotFoundException>().having(
  -              (e) => e.message,
  +              (e) => e.toString(),
                 'description',
                 'Permission definitions are not found.',
               ),
  
positive.code:           accuracyFuture,
            throwsA(
              isA<ApproximateLocationNotSupportedException>().having(
                (e) => e.message,
                'description',
                'Approximate location not supported.',
              ),
  
negative.code:           accuracyFuture,
            throwsA(
              isA<AccuracyDictionaryNotFoundException>().having(
                (e) => e.toString(),
                'description',
                'Accuracy definition missing.',
              ),
  