add panicking test

Author: NathanSWard

crates/bevy_ecs/src/system/commands/mod.rs

@@ -402,7 +402,7 @@ impl<T> Debug for InsertBundleError<T> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("InsertBundleError")
             .field("entity", &self.entity)
-            .field("bundle", &std::any::type_name::<T>())
+            .field("bundle_type", &std::any::type_name::<T>())
             .finish()
     }
 }
@@ -441,7 +441,7 @@ impl<T> Debug for InsertError<T> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("InsertError")
             .field("entity", &self.entity)
-            .field("component", &std::any::type_name::<T>())
+            .field("component_type", &std::any::type_name::<T>())
             .finish()
     }
 }
@@ -748,4 +748,19 @@ mod tests {
 
         assert_eq!(invoked.load(Ordering::Relaxed), 1);
     }
+
+    #[test]
+    #[should_panic]
+    fn test_panicking_error_handler() {
+        std::panic::set_hook(Box::new(|_| {})); // prevents printing of stack trace.
+
+        let mut world = World::default();
+        let mut queue = CommandQueue::default();
+        {
+            let mut commands = Commands::new(&mut queue, &world);
+            let invalid_entity = Entity::new(42);
+            commands.entity(invalid_entity).despawn().panic_on_failure();
+        }
+        queue.apply(&mut world);
+    }
 }