fix state factory support, tests for state and state factory

src/responder.rs

@@ -272,3 +272,40 @@ where
         Ok(self.0.poll().map_err(|e| e.into())?)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    // use actix_http::body::Body;
+    use actix_http::body::{Body, ResponseBody};
+    use actix_http::http::StatusCode;
+    use actix_service::{IntoNewService, NewService, Service};
+    use bytes::Bytes;
+
+    use crate::test::TestRequest;
+    use crate::App;
+
+    #[test]
+    fn test_option_responder() {
+        let mut rt = actix_rt::Runtime::new().unwrap();
+        let app = App::new()
+            .resource("/none", |r| r.to(|| -> Option<&'static str> { None }))
+            .resource("/some", |r| r.to(|| Some("some")))
+            .into_new_service();
+        let mut srv = rt.block_on(app.new_service(&())).unwrap();
+
+        let req = TestRequest::with_uri("/none").to_request();
+        let resp = rt.block_on(srv.call(req)).unwrap();
+        assert_eq!(resp.status(), StatusCode::NOT_FOUND);
+
+        let req = TestRequest::with_uri("/some").to_request();
+        let resp = rt.block_on(srv.call(req)).unwrap();
+        assert_eq!(resp.status(), StatusCode::OK);
+        match resp.body() {
+            ResponseBody::Body(Body::Bytes(ref b)) => {
+                let bytes: Bytes = b.clone().into();
+                assert_eq!(bytes, Bytes::from_static(b"some"));
+            }
+            _ => panic!(),
+        }
+    }
+}