Create testWidget with Obx and pump

[hudsoncadan]

I'd like to know about testing my widget with Obx().
I'm trying to create two scenarios in the same test. I know I could split it into two tests, but just for curiousity, I'd like to know if it's possible to test using Obx.
Follow the steps:

Gostaria de saber como testar meu widget utilizando Obx().
Estou tentando criar dois cenários no mesmo teste. Eu sei que eu deveria separá-los, mas apenas por curiosidade, eu gostaria de saber se é possível criar um test com Obx.
Estou seguindo os seguintes passos:

• Crio meu Widget e injeto o Controller

   setUp(() {
     Get.testMode = true;

     homeView = HomeView();
     app = MaterialApp(home: homeView);

     Get.put(HomeController());
   });

• Inicializo o widget -> Faço modificações no Controller -> Atualizo o widget

testWidgets('OrderItem list is not empty', (WidgetTester tester) async {
      await tester.pumpWidget(app);

      final keyNoItemWidgetFinder = find.byKey(const Key(HomeView.keyNoItemWidget));
      final keyListOrderFinder = find.byKey(const Key(HomeView.keyListOrder));

      expect(homeView.controller.order.items.isEmpty, true);
      expect(keyNoItemWidgetFinder, findsOneWidget);
      expect(keyListOrderFinder, findsNothing);

      homeView.controller.order.addOrderItem(
        OrderItemModel(product: ProductModel(id: 1, description: 'Product 1', price: 1)),
      );
      homeView.controller.order.addOrderItem(
        OrderItemModel(product: ProductModel(id: 2, description: 'Product 2', price: 2)),
      );

      await tester.pump();

      expect(homeView.controller.order.items.isEmpty, false);
      expect(keyNoItemWidgetFinder, findsNothing);
      expect(keyListOrderFinder, findsOneWidget);
    });

• Erro na seguinte linha (means one was found but none were expected)

expect(keyNoItemWidgetFinder, findsNothing);

---

If I try to test just one scenario, it works fine:
Se eu separar e mantê-lo da seguinte maneira, funciona:

    testWidgets('OrderItem list is not empty', (WidgetTester tester) async {
      homeView.controller.order.addOrderItem(
        OrderItemModel(product: ProductModel(id: 1, description: 'Product 1', price: 1)),
      );
      homeView.controller.order.addOrderItem(
        OrderItemModel(product: ProductModel(id: 2, description: 'Product 2', price: 2)),
      );

      await tester.pumpWidget(app);

      final keyNoItemWidgetFinder = find.byKey(const Key(HomeView.keyNoItemWidget));
      final keyListOrderFinder = find.byKey(const Key(HomeView.keyListOrder));
      
      expect(homeView.controller.order.items.isEmpty, false);
      expect(keyNoItemWidgetFinder, findsNothing);
      expect(keyListOrderFinder, findsOneWidget);
    });

I'd like to test using pump() and Obx().
Mas gostaria de utilizar o pump() com o Obx().

---

[SOLUTION]:

We shouldn't manipulate the controller directly, instead of it, use the widgets available on the screen.
I mean, I was trying to add items to the list by calling the controller's method. So, instead of if, there is a button on the widget to manipulate the list. I just tap on it.

Nós não devemos manipular o controller diretamente, e ao invés disso, devemos utilizar os widgets disponíveis na tela.
Em outras palavras, eu estava adicionando itens na lista através de um método disponível no controller. Então, ao invés de seguir essa abordagem, existe um botão no Widget para manipular a lista. Em resumo, estou apenas pressionando o botão.

    testWidgets('OrderItem list is not empty', (WidgetTester tester) async {
      await tester.pumpWidget(app);

      final keyNoItemWidgetFinder = find.byKey(const Key(HomeView.keyNoItemWidget));
      final keyListOrderFinder = find.byKey(const Key(HomeView.keyListOrder));
      final keyButtonAddOrderItem = find.byKey(const Key(HomeView.keyButtonAddOrderItem));

      expect(homeView.controller.order.items.isEmpty, true);
      expect(keyNoItemWidgetFinder, findsOneWidget);
      expect(keyListOrderFinder, findsNothing);

      await tester.tap(keyButtonAddOrderItem);
      await tester.pump();

      expect(homeView.controller.order.items.isEmpty, false);
      expect(keyNoItemWidgetFinder, findsNothing);
      expect(keyListOrderFinder, findsOneWidget);
    });