New ability to override RouteGroupInterface in the Route class

Slim/Routing/Route.php

@@ -108,7 +108,7 @@ class Route implements RouteInterface, RequestHandlerInterface
      * @param CallableResolverInterface        $callableResolver
      * @param ContainerInterface|null          $container
      * @param InvocationStrategyInterface|null $invocationStrategy
-     * @param RouteGroup[]                     $groups     The parent route groups
+     * @param RouteGroupInterface[]            $groups     The parent route groups
      * @param int                              $identifier The route identifier
      */
     public function __construct(

Slim/Routing/RouteCollector.php

@@ -17,6 +17,7 @@
 use Slim\Interfaces\CallableResolverInterface;
 use Slim\Interfaces\InvocationStrategyInterface;
 use Slim\Interfaces\RouteCollectorInterface;
+use Slim\Interfaces\RouteCollectorProxyInterface;
 use Slim\Interfaces\RouteGroupInterface;
 use Slim\Interfaces\RouteInterface;
 use Slim\Interfaces\RouteParserInterface;
@@ -69,7 +70,7 @@ class RouteCollector implements RouteCollectorInterface
     /**
      * Route groups
      *
-     * @var RouteGroup[]
+     * @var RouteGroupInterface[]
      */
     protected array $routeGroups = [];
 
@@ -224,15 +225,7 @@ public function lookupRoute(string $identifier): RouteInterface
      */
     public function group(string $pattern, $callable): RouteGroupInterface
     {
-        $routeCollectorProxy = new RouteCollectorProxy(
-            $this->responseFactory,
-            $this->callableResolver,
-            $this->container,
-            $this,
-            $pattern
-        );
-
-        $routeGroup = new RouteGroup($pattern, $callable, $this->callableResolver, $routeCollectorProxy);
+        $routeGroup = $this->createGroup($pattern, $callable);
         $this->routeGroups[] = $routeGroup;
 
         $routeGroup->collectRoutes();
@@ -241,6 +234,26 @@ public function group(string $pattern, $callable): RouteGroupInterface
         return $routeGroup;
     }
 
+    /**
+     * @param string|callable $callable
+     */
+    protected function createGroup(string $pattern, $callable): RouteGroupInterface
+    {
+        $routeCollectorProxy = $this->createProxy($pattern);
+        return new RouteGroup($pattern, $callable, $this->callableResolver, $routeCollectorProxy);
+    }
+
+    protected function createProxy(string $pattern): RouteCollectorProxyInterface
+    {
+        return new RouteCollectorProxy(
+            $this->responseFactory,
+            $this->callableResolver,
+            $this->container,
+            $this,
+            $pattern
+        );
+    }
+
     /**
      * {@inheritdoc}
      */