anchor.diff:      final String testValue = kThreeLines;
       final String cutValue = 'First line of stuff keeps going until abcdef ghijk. ';
       await tester.enterText(find.byType(EditableText), testValue);
  -    await tester.idle();
   
       await tester.pumpWidget(builder());
   
  
positive.code:     await tester.pumpWidget(builder());
  
      await tester.enterText(find.byType(EditableText), kFourLines);
      await tester.idle();
  
      await tester.pumpWidget(builder());
  
  
negative.code:     final Size emptyInputSize = inputBox.size;
  
      await tester.enterText(find.byType(EditableText), 'No wrapping here.');
      await tester.pumpWidget(builder(3));
      expect(findInputBox(), equals(inputBox));
      expect(inputBox.size, equals(emptyInputSize));
  
      await tester.enterText(find.byType(EditableText), kThreeLines);
      await tester.pumpWidget(builder(3));
      expect(findInputBox(), equals(inputBox));
      expect(inputBox.size, greaterThan(emptyInputSize));
  