@BeforeEach
    public void setUp() {
        shenyuServiceInstances = new CopyOnWriteArrayList<>();
        shenyuServiceInstances.add(mock(ShenyuServiceInstance.class));
        shenyuServiceInstanceLists = new ShenyuServiceInstanceLists(shenyuServiceInstances, appName);
    }
The Test Case For {@link ShenyuServiceInstanceLists}.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/test/java/org/apache/shenyu/plugin/grpc/resolver/ShenyuServiceInstanceListsTest.java