Flutter 错误状态：调用关闭后无法发出新状态

我有一个问题，在Flutter 的测试部分，我写了一个使用CUBIT的简单计数器应用程序的测试，但当我运行所有测试时，它给了我标题中提到的错误，有人知道为什么吗？

必须指出的是，虽然我逐个运行测试都运行成功，但当我运行所有组时，它在第二次和第三次测试中返回错误...

这些是MU代码

group("Counter Cubit", () {
    CounterCubit counterCubit = CounterCubit();
    setUp(() {
      //counterCubit = CounterCubit();
    });

    tearDown(() {
      counterCubit.close();
    });

    test("The initial state for counterCubit is CounterState(counterValue: 0)",
        () {
      expect(counterCubit.state, CounterState(0, false));
    });

    blocTest(
        "The cubit should emit CounterState(counter: 1, isIncrement: true) while we call 
          counterCubit.increment() ",
        build: () => counterCubit,
        act: (CounterCubit cubit) => cubit.increment(),
        expect: () => [CounterState(1, true)]);

    blocTest(
        "The cubit should emit CounterState(counter: -1, isIncrement: false) while we call 
           counterCubit.decrement() ",
        build: () => counterCubit,
        act: (CounterCubit cubit) => cubit.decrement(),
        expect: () => [CounterState(-1, false)]);
});

我的肘长和境界如下:

class CounterCubit extends Cubit<CounterState> {
  CounterCubit() : super(CounterState(0, false));

  void increment() => emit(CounterState(state.counter + 1, true));

  void decrement() => emit(CounterState(state.counter - 1, false));
}

并声明如下:

class CounterState extends Equatable {
  final int counter;
  final bool isIncremented;
  CounterState(this.counter, this.isIncremented);

  @override
  List<Object?> get props => [counter, isIncremented];
}