anchor.diff:            'value': 'Brightness.light',
           }
         );
  -      expect(verifyResponse.json['value'], 'Brightness.light');
  +      expect(verifyResponse.json?['value'], 'Brightness.light');
   
         // Change with a bogus value
         final Response bogusResponse = await vmService.callServiceExtension(
  
positive.code:           'enabled': 'true',
          }
        );
        expect(updateResponse.json['enabled'], 'true');
      });
    });
  }
  
negative.code:       final ProtocolList protocolList =
            await vmService.getSupportedProtocols();
        expect(protocolList.protocols, hasLength(2));
        for (final Protocol protocol in protocolList.protocols!) {
          expect(protocol.protocolName, anyOf('VM Service', 'DDS'));
        }
      });
  