anchor.diff:  import 'package:flutter_tools/src/base/file_system.dart';
   import 'package:flutter_tools/src/base/logger.dart';
   import 'package:flutter_tools/src/reporting/reporting.dart';
  -import 'package:mockito/mockito.dart';
   
   import '../../src/common.dart';
   
  
positive.code:       fileSystem: fileSystem,
        logger: logger,
        appFilenamePattern: RegExp(r'lib.*app\.so'),
        flutterUsage: MockUsage(),
      );
  
      final Archive archive = Archive()
  
negative.code:     expect(result['precompiler-trace'], <String, Object>{});
    });
  }
  