anchor.diff:  import 'package:quiver/testing/async.dart';
   import 'package:sky/rendering.dart';
   import 'package:sky/services.dart';
  -import 'package:sky/widgets.dart';
  +import 'package:sky/widgets_next.dart';
   import 'package:test/test.dart';
   
  -import 'widget_tester.dart';
  +import '../fn3/widget_tester.dart';
   import '../services/mock_services.dart';
   
   class MockKeyboard implements KeyboardService {
  
positive.code:       );
      }
  
      tester.pumpFrame(builder);
  
      Input input = tester.findWidget((Widget widget) => widget.key == inputKey);
      Size emptyInputSize = (input.renderObject as RenderBox).size;
  
      // Simulate entry of text through the keyboard.
  
negative.code:     // Check that the onChanged event handler fired.
      expect(inputValue, equals(testValue));
  
      tester.pumpFrame(builder());
  
      // Check that the Input with text has the same size as the empty Input.
      expect((input.renderObject as RenderBox).size, equals(emptyInputSize));
  