Spec getSpec() {
        return spec;
    }
@Test
    void basic() {
        ProxyServer proxy = createTestServer(new MockConfigSource());
        Spec spec = new Spec("localhost", 12345);
        ConfigProxyRpcServer server = new ConfigProxyRpcServer(proxy, new Supervisor(new Transport()), spec);
        assertEquals(spec, server.getSpec());
    }