使用await使用JUnit测试FirebaseFirestore，错误

@Test
public async void testFirestore() {
    // 使用await关键字等待异步操作的完成
    DocumentSnapshot snapshot = await FirebaseFirestore.getInstance().collection("users").document("user1").get();
    // 断言或其他测试逻辑
    assertNotNull(snapshot);
}

@BeforeClass
public static void setUp() {
    // 初始化FirebaseApp
    FirebaseApp.initializeApp();
}

@Test
public async void testFirestore() {
    // 获取FirebaseFirestore实例
    FirebaseFirestore firestore = FirebaseFirestore.getInstance();
    // 使用firestore进行测试
    // ...
}

<!-- Firebase依赖 -->
<dependency>
    <groupId>com.google.firebase</groupId>
    <artifactId>firebase-admin</artifactId>
    <version>7.0.0</version>
</dependency>

<!-- JUnit依赖 -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

@Rule
public FirebaseEmulatorRule emulatorRule = new FirebaseEmulatorRule();

@Test
public async void testFirestore() {
    // 使用模拟身份验证进行测试
    // ...
}