anchor.diff:        client = null;
         url = null;
         greetingService = null;
  +    });
  +
  +    test('query fields mapped to filters', () async {
  +      await greetingService.create({'foo': 'bar'});
  +      expect(
  +        await greetingService.index({
  +          'query': {'foo': 'not bar'}
  +        }),
  +        isEmpty,
  +      );
  +      expect(
  +        await greetingService.index(),
  +        isNotEmpty,
  +      );
       });
   
       test('insert items', () async {
  
positive.code: import 'package:angel_framework/angel_framework.dart';
  import 'package:angel_mongo/angel_mongo.dart';
  import 'package:http/http.dart' as http;
  import 'package:json_god/json_god.dart' as god;
  
negative.code: 
        app.use('/api', greetingService);
  
        await transport.startServer('127.0.0.1', 0);
        url = transport.uri.toString();
      });
  
      tearDown(() async {
  