@BeforeEach
    public void setUp() {
        applicationConfigCache = ApplicationConfigCache.getInstance();
        selector = mock(SelectorData.class);
        when(selector.getName()).thenReturn("/grpc");
        when(selector.getHandle()).thenReturn("[{\"upstreamUrl\":\"localhost:8080\",\"weight\":50,\"status\":true}]");
    }
The Test Case For {@link ApplicationConfigCache}.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/test/java/org/apache/shenyu/plugin/grpc/cache/ApplicationConfigCacheTest.java