I'm trying to test this piece of code, however I only get coverage up to onConfirm: () => and can't find a way to trigger the callback, so it gets to the next line of code. Does anybody have any suggestions on how to proceed with this?

deleteUser(Id) {

    const storage = new Storage();
    const { username } = Storage.getById(Id);

    Message.showConfirm({
        content: Id === User.getId() ? translate('confirm') : translate('delete',),
        onConfirm: () => {
            Storage.deleteMember(Id);

            const rowElement = this.container.querySelector(`tr[data-user-id="${Id}"]`);

            DOMHelper.removeElement(rowElement);
        }
    });
}