public static void addSupplier(String interfaceName, Function<Invoker<?>, Object> supplier) {
        STUB_SUPPLIERS.put(interfaceName, supplier);
    }
@Test
    void addSupplier() {
        Invoker<?> invoker = Mockito.mock(Invoker.class);
        ServiceDescriptor descriptor = Mockito.mock(ServiceDescriptor.class);
        StubSuppliers.addSupplier(serviceName, i -> invoker);
        Assertions.assertEquals(invoker, StubSuppliers.createStub(serviceName, invoker));
    }