Avoid !is_inside_world() error for camera frustum test

Author: Waridley

test/src/test_vararray_return.rs

@@ -20,9 +20,28 @@ fn test_vararray_return_crash() -> bool {
 
         camera.set_frustum(5.0, Vector2::new(1.0, 2.0), 0.0, 1.0);
 
-        camera.get_frustum(); // this should not crash!
-
-        camera.free();
+        // `get_frustum` now prints an error and returns a default value
+        // if the camera is not inside the world
+        unsafe {
+            let camera = camera.into_shared();
+
+            gdnative::api::Engine::godot_singleton()
+                .get_main_loop()
+                .expect("missing MainLoop")
+                .assume_safe()
+                .cast::<SceneTree>()
+                .expect("MainLoop is not a SceneTree")
+                .current_scene()
+                .expect("missing current scene")
+                .assume_safe()
+                .add_child(camera, false);
+
+            let camera = camera.assume_safe();
+
+            camera.get_frustum(); // this should not crash!
+
+            camera.queue_free();
+        }
     })
     .is_ok();