TypeError:无法定义单例(RSpec)

Question

这可能看起来像一个新手问题,但我很难过.我正在尝试构建一个简单的Ruby冗余服务,并且我正在使用RSpec进行一些单元测试.我碰到了这个奇怪的问题,我看不出发生了什么.

RSpec.describe SlackService do
  let(:token) { 'BOT-TOKEN' }
  subject do
    SlackService.new(token)
  end

  describe '#channel_list' do
    context 'get channels' do
      let(:client) { instance_double(Slack::Web::Client) }
      before(:each) do
        allow(:subject).to receive(:client) { client }
        @result = subject.channel_list
      end
      it { expect(@result).to eq [] }
    end
  end
end

我跑的时候得到的错误rspec是

Failures:

  1) SlackService#channel_list get channels
     Failure/Error: allow(:subject).to receive(:client) { instance_double(Slack::Web::Client) }

     TypeError:
       can't define singleton
     # ./spec/slack_service_spec.rb:12:in `block (4 levels) in <top (required)>'

如果有人需要更多信息,将进行编辑 知道这个错误意味着什么吗？无论如何,我似乎无法摆脱它.

Answer 1

这似乎是一个错字.应该是主体而不是:主题

allow(subject).to receive(:client) { client }