anchor.diff:      await tester.pumpWidget(builder());
   
       await tester.enterText(find.byType(EditableText), kFourLines);
  -    await tester.idle();
   
       await tester.pumpWidget(builder());
   
  
positive.code: 
      final String testValue = 'abc def ghi';
      await tester.enterText(find.byType(EditableText), testValue);
      await tester.idle();
      await tester.pumpWidget(builder());
  
      // Tap the selection handle to bring up the "paste / select all" menu.
  
negative.code: 
      // An extra line won't increase the size because we max at 3.
      await tester.enterText(find.byType(EditableText), kFourLines);
      await tester.pumpWidget(builder(3));
      expect(findInputBox(), equals(inputBox));
      expect(inputBox.size, threeLineInputSize);
  
      // But now it will.
      await tester.enterText(find.byType(EditableText), kFourLines);
      await tester.pumpWidget(builder(4));
      expect(findInputBox(), equals(inputBox));
      expect(inputBox.size, greaterThan(threeLineInputSize));
  