modied docs for read_response_json

src/test.rs

@@ -371,8 +371,20 @@ impl TestRequest {
     ///
     /// ```rust
     /// use actix_web::{App, test};
+    /// use serde::{Serialize, Deserialize};
+    /// 
+    /// #[derive(Serialize, Deserialize)]
+    /// pub struct Person { id: String, name: String }
+    /// 
+    /// #[test]
+    /// fn test_add_person() {
+    ///     let mut app = test::init_service(App::new().service(
+    ///                              web::resource("/people")
+    ///                                .route(web::post().to(|person: Json<Person>| {
+    ///                                       HttpResponse::Ok()
+    ///                                          .json(person.into_inner())})
+    ///                                 )));
     /// 
-    /// let mut app = test::init_service(App::new());
     ///     let payload = r#"{"id":"12345","name":"Nikolay Kim"}"#.as_bytes();
     /// 
     ///     let req = test::TestRequest::post()
@@ -381,7 +393,8 @@ impl TestRequest {
     ///                      .set_payload(payload)
     ///                      .to_request();
     /// 
-    /// let result = read_response_json<_, _, _, serde_json::Value>(&mut app, req);
+    ///     let result = read_response_json<_, _, _, Person>(&mut app, req);
+    /// }
     /// ```
     pub fn read_response_json<S, R, B, T>(app: &mut S, req: R) -> T
     where