anchor.diff:  library validator_test;
   
   import 'package:validator/validator.dart' as v;
  +
   
   void test(Map options) {
     List args = options['args'];
  
positive.code:       ],
    });
  }
  
  void testIsAlphanumeric() {
    test({
  
negative.code:   });
  }
  
  
  void testIsLowercase() {
    test({
      'validator': v.isLowercase,
  