ft: add tests

README.md

@@ -1,31 +1,39 @@
 # go-session-redis
 Simple HTTP session management
 
-## Example middleware (Chi router)
+## Example middleware
 ```go
-func SessionAuthenticator(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		s, err := session.SessionManager.GetOrCreateSession(w, r)
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusUnauthorized)
-			return
-		}
+func SessionAuthenticator(manager *session.Manager, next http.Handler) http.Handler {
+    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+        s, err := manager.GetSession(w, r)
+        if errors.Is(err, session.ErrSessionNotFound) {
+            http.Error(w, "Not authenticated", http.StatusUnauthorized)
+            return
+        }
+        if err != nil {
+            http.Error(w, err.Error(), http.StatusBadGateway)
+            return
+        }
 
-		id := s.Get("id")
-		if id == "" || id == nil {
-			http.Error(w, "Not authenticated", http.StatusUnauthorized)
-			return
-		}
+        userID, ok := s.Get("user_id").(string)
+        if !ok || userID == "" {
+            http.Error(w, "Not authenticated", http.StatusUnauthorized)
+            return
+        }
 
-		err = s.UpdateTTL()
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusBadGateway)
-			return
-		}
+        // GetSession refreshes the TTL.
+        next.ServeHTTP(w, r)
+    })
+}
+```
 
-		// Session is valid
-		next.ServeHTTP(w, r)
-	})
+## Creating a session
+```go
+func CreateAuthenticatedSession(manager *session.Manager, w http.ResponseWriter, r *http.Request, userID string) error {
+    s, err := manager.CreateSession(w, r)
+    if err != nil {
+        return err
+    }
+    return s.Set("user_id", userID)
 }
-
 ```