You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: qobject.rs
    path of file: ./repos/ritual/qt_ritual/crate_templates/moqt_core/tests
    
    the code of the file until where you have to start completion: use cpp_core::NullPtr;
use moqt_core::{QObject, QPtr, SlotOfInt};
use std::cell::RefCell;
use std::ffi::CStr;
use std::rc::Rc;

#[test]
fn qobject() {
    unsafe {
        let obj1 = QObject::new_0a();
        let obj2 = QObject::new_0a();
        let c = obj1.destroyed().connect(obj2.slot_delete_later());
        assert!(c.is_valid());

        let args = QObject::next_connect_args();
        assert_eq!(args.sender().as_raw_ptr(), obj1.as_raw_ptr());
        assert_eq!(args.receiver().as_raw_ptr(), obj2.as_raw_ptr());

        let signal = CStr::from_ptr(args.signal()).to_str().unwrap();
        assert_eq!(signal, "2destroyed(QObject *)");

        let method = CStr::from_ptr(args.meth
    
fn closure_slot_connect() {
    unsafe {
        let obj1 = QObject::new_0a();
        let counter = Rc::new(RefCell::new(0));
        let counter_handle = Rc::clone(&counter);
        let slot = SlotOfInt::new(NullPtr, move |arg| {
            *counter_handle.borrow_mut() += arg;
        });
        let c = obj1.object_name_changed().connect(&slot);
        assert!(c.is_valid());

        let args = QObject::next_connect_args();
        assert_eq!(args.sender().as_raw_ptr(), obj1.as_raw_ptr());

        let signal = CStr::from_ptr(args.signal()).to_str().unwrap();
        assert_eq!(signal, "2objectNameChanged(int)");

        let slot_as_qobject: QPtr<QObject> = slot.static_upcast();
        assert_eq!(args.receiver().as_raw_ptr(), slot_as_qobject.as_raw_ptr());

        let method = CStr::from_ptr(args.method()).to_str().unwrap();
        assert_eq!(method, "1slot_(int)");

        assert_eq!(*counter.borrow(), 0);
        slot.slot(2);
        assert_eq!(*counter.borrow(), 2);
        slot.slot(4);
        assert_eq!(*counter.borrow(), 6);

        slot.set(|_| ());
        slot.slot(8);
        assert_eq!(*counter.borrow(), 6);
    }
}