anchor.diff:          key = null;
         });
   
  -      test('remove', () async {
  +      test("remove", () async {
           var eventFuture = ref.onValue.first;
   
           await ref.remove();
  
positive.code:         expect(event.snapshot.val()["text"], "ahoj");
        });
  
        test('transaction', () async {
          var childRef = ref.child("todos");
          childRef.set("Cooking");
  
  
negative.code:     });
    });
  }
  
  class _TestClass {}
  