anchor.diff:          MDnsObservatoryDiscovery: () => mockMDnsObservatoryDiscovery,
           Platform: () => macPlatform,
           ProcessManager: () => mockProcessManager,
  +        Usage: () => mockUsage,
         });
   
         testUsingContext(' fails in debug mode when mDNS fails and when Observatory URI is malformed', () async {
  
positive.code:       MockPortForwarder mockPortForwarder;
        MockIMobileDevice mockIMobileDevice;
        MockIOSDeploy mockIosDeploy;
  
        Directory tempDir;
        Directory projectDir;
  
negative.code: import 'package:flutter_tools/src/macos/xcode.dart';
  import 'package:flutter_tools/src/mdns_discovery.dart';
  import 'package:flutter_tools/src/project.dart';
  import 'package:flutter_tools/src/reporting/reporting.dart';
  import 'package:meta/meta.dart';
  import 'package:mockito/mockito.dart';
  import 'package:platform/platform.dart';
  