public static void IsRemoveUserFromChatWorks()
        {
            var user        = usrPrv.GetUserById(1);
            var chat        = chatPrv.GetChatById(2);
            int usersBefore = chatPrv.GetUsersOfChat(chat).Count;

            chatPrv.RemoveUserFromChat(user, chat);
            int usersAfter = chatPrv.GetUsersOfChat(chat).Count;

            Assert.That(usersAfter == usersBefore - 1);
        }