public void testInvoke() {
server.setMockResponseCode(200);
RestClient client = getRestClient();
Resource resource = client.resource(serviceURL);
String string = resource.invoke("GET", String.class, null);
assertEquals(RECEIVED_MESSAGE, string);
// test generic entity
TestGenerics<String> tg = resource.invoke("GET", new EntityType<TestGenerics<String>>() {
}, null);