Rework actix session (#212)

Co-authored-by: Rob Ede <robjtede@icloud.com>
Co-authored-by: Luca P <rust@lpalmieri.com>
Co-authored-by: Sebastian Rollén <38324289+SebRollen@users.noreply.github.com>

actix-session/tests/session.rs

@@ -0,0 +1,70 @@
+use actix_session::{SessionExt, SessionStatus};
+use actix_web::{test, HttpResponse};
+
+#[actix_web::test]
+async fn session() {
+    let req = test::TestRequest::default().to_srv_request();
+    let session = req.get_session();
+    session.insert("key", "value").unwrap();
+    let res = session.get::<String>("key").unwrap();
+    assert_eq!(res, Some("value".to_string()));
+
+    session.insert("key2", "value2").unwrap();
+    session.remove("key");
+
+    let res = req.into_response(HttpResponse::Ok().finish());
+    let state: Vec<_> = res.get_session().entries().clone().into_iter().collect();
+    assert_eq!(
+        state.as_slice(),
+        [("key2".to_string(), "\"value2\"".to_string())]
+    );
+}
+
+#[actix_web::test]
+async fn get_session() {
+    let req = test::TestRequest::default().to_srv_request();
+
+    let session = req.get_session();
+    session.insert("key", true).unwrap();
+    let res = session.get("key").unwrap();
+    assert_eq!(res, Some(true));
+}
+
+#[actix_web::test]
+async fn get_session_from_request_head() {
+    let req = test::TestRequest::default().to_srv_request();
+
+    let session = req.get_session();
+    session.insert("key", 10).unwrap();
+    let res = session.get::<u32>("key").unwrap();
+    assert_eq!(res, Some(10));
+}
+
+#[actix_web::test]
+async fn purge_session() {
+    let req = test::TestRequest::default().to_srv_request();
+    let session = req.get_session();
+    assert_eq!(session.status(), SessionStatus::Unchanged);
+    session.purge();
+    assert_eq!(session.status(), SessionStatus::Purged);
+}
+
+#[actix_web::test]
+async fn renew_session() {
+    let req = test::TestRequest::default().to_srv_request();
+    let session = req.get_session();
+    assert_eq!(session.status(), SessionStatus::Unchanged);
+    session.renew();
+    assert_eq!(session.status(), SessionStatus::Renewed);
+}
+
+#[actix_web::test]
+async fn session_entries() {
+    let req = test::TestRequest::default().to_srv_request();
+    let session = req.get_session();
+    session.insert("test_str", "val").unwrap();
+    session.insert("test_str", 1).unwrap();
+    let map = session.entries();
+    map.contains_key("test_str");
+    map.contains_key("test_num");
+}