add basic test for proc macro

tests/test_macro.rs

@@ -0,0 +1,17 @@
+use actix_http::HttpService;
+use actix_http_test::TestServer;
+use actix_web::{get, App, HttpResponse, Responder};
+
+#[get("/test")]
+fn test() -> impl Responder {
+    HttpResponse::Ok()
+}
+
+#[test]
+fn test_body() {
+    let mut srv = TestServer::new(|| HttpService::new(App::new().service(test)));
+
+    let request = srv.get().uri(srv.url("/test")).finish().unwrap();
+    let response = srv.send_request(request).unwrap();
+    assert!(response.status().is_success());
+}