can't perform a react state update on an unmounted component. this is a no-op but jest code example

Example 1: react warning can't perform a react state update on an unmounted component

componentWillUnmount() {
    // fix Warning: Can't perform a React state update on an unmounted component
    this.setState = (state,callback)=>{
        return;
    };
}

Example 2: Can't perform a React state update on an unmounted component

useEffect(() => {
    const source = axios.CancelToken.source()

    const fetchUsers = async () => {
        try {
            await Axios.get('/users', {
                cancelToken: source.token,
            })
            // ...
        } catch (error) {
            if (Axios.isCancel(error)) {
            } else {
                throw error
            }
        }
    }

    fetchData()

    return () => {
        source.cancel()
    }
}, [])