add tests to scope and resource for returning from fns

src/app.rs

@@ -709,24 +709,24 @@ mod tests {
         assert_eq!(body, Bytes::from_static(b"https://youtube.com/watch/12345"));
     }
 
-    /// compile-only test for returning app type from function
-    pub fn foreign_app_type() -> App<
-        impl ServiceFactory<
-            ServiceRequest,
-            Response = ServiceResponse<impl MessageBody>,
-            Config = (),
-            InitError = (),
-            Error = Error,
-        >,
-    > {
-        App::new()
-            // logger can be removed without affecting the return type
-            .wrap(crate::middleware::Logger::default())
-            .route("/", web::to(|| async { "hello" }))
-    }
-
     #[test]
-    fn return_foreign_app_type() {
+    fn can_be_returned_from_fn() {
-        let _app = foreign_app_type();
+        /// compile-only test for returning app type from function
+        pub fn my_app() -> App<
+            impl ServiceFactory<
+                ServiceRequest,
+                Response = ServiceResponse<impl MessageBody>,
+                Config = (),
+                InitError = (),
+                Error = Error,
+            >,
+        > {
+            App::new()
+                // logger can be removed without affecting the return type
+                .wrap(crate::middleware::Logger::default())
+                .route("/", web::to(|| async { "hello" }))
+        }
+
+        let _ = init_service(my_app());
     }
 }

src/resource.rs

@@ -505,18 +505,48 @@ mod tests {
     use actix_service::Service;
     use actix_utils::future::ok;
 
+    use super::*;
     use crate::{
         guard,
         http::{
             header::{self, HeaderValue},
             Method, StatusCode,
         },
-        middleware::DefaultHeaders,
+        middleware::{Compat, DefaultHeaders},
         service::{ServiceRequest, ServiceResponse},
         test::{call_service, init_service, TestRequest},
         web, App, Error, HttpMessage, HttpResponse,
     };
 
+    #[test]
+    fn can_be_returned_from_fn() {
+        fn my_resource() -> Resource {
+            web::resource("/test").route(web::get().to(|| async { "hello" }))
+        }
+
+        fn my_compat_resource() -> Resource<
+            impl ServiceFactory<
+                ServiceRequest,
+                Config = (),
+                Response = ServiceResponse,
+                Error = Error,
+                InitError = (),
+            >,
+        > {
+            web::resource("/test-compat")
+                // .wrap_fn(|req, srv| {
+                //     let fut = srv.call(req);
+                //     async { Ok(fut.await?.map_into_right_body::<()>()) }
+                // })
+                .wrap(Compat::new(DefaultHeaders::new()))
+                .route(web::get().to(|| async { "hello" }))
+        }
+
+        App::new()
+            .service(my_resource())
+            .service(my_compat_resource());
+    }
+
     #[actix_rt::test]
     async fn test_middleware() {
         let srv = init_service(

src/scope.rs

@@ -586,18 +586,47 @@ mod tests {
     use actix_utils::future::ok;
     use bytes::Bytes;
 
+    use super::*;
     use crate::{
         guard,
         http::{
             header::{self, HeaderValue},
             Method, StatusCode,
         },
-        middleware::DefaultHeaders,
+        middleware::{Compat, DefaultHeaders},
         service::{ServiceRequest, ServiceResponse},
         test::{assert_body_eq, call_service, init_service, read_body, TestRequest},
         web, App, HttpMessage, HttpRequest, HttpResponse,
     };
 
+    #[test]
+    fn can_be_returned_from_fn() {
+        fn my_scope() -> Scope {
+            web::scope("/test")
+                .service(web::resource("").route(web::get().to(|| async { "hello" })))
+        }
+
+        fn my_compat_scope() -> Scope<
+            impl ServiceFactory<
+                ServiceRequest,
+                Config = (),
+                Response = ServiceResponse,
+                Error = Error,
+                InitError = (),
+            >,
+        > {
+            web::scope("/test-compat")
+                // .wrap_fn(|req, srv| {
+                //     let fut = srv.call(req);
+                //     async { Ok(fut.await?.map_into_right_body::<()>()) }
+                // })
+                .wrap(Compat::new(DefaultHeaders::new()))
+                .service(web::resource("").route(web::get().to(|| async { "hello" })))
+        }
+
+        App::new().service(my_scope()).service(my_compat_scope());
+    }
+
     #[actix_rt::test]
     async fn test_scope() {
         let srv =