public void WhenDeletingAbsenteeUserToChat_DeleteParticipantFromChat_ShouldThrowException() { ChatsRepository chatsRepository = new ChatsRepository(); Guid id = Guid.NewGuid(); Channel channel = new Channel(id, "title"); Guid absenteeId = new Guid(); var chatId = channel.GetId(); chatsRepository.DeleteUserFromChat(chatId, absenteeId); }