Rails / Rspec：我将如何测试#any？对于 Sidekiq？答案

【问题标题】：Rails / Rspec: How would I test #any? for Sidekiq?Rails / Rspec：我将如何测试#any？对于 Sidekiq？
【发布时间】：2015-06-24 11:42:53
【问题描述】：

我有一个障碍：

def already_syncing?
  Sidekiq::Queue.new(queue_name).any? { |q| q.args[0] == car_id }
end

我将如何测试这个？如果我像这样把它存根：

allow(Sidekiq::Queue).to receive_message_chain(:new, :any?) { true }

那么我的实际块中的条件没有测试。

【问题讨论】：

标签： rspec sidekiq

【解决方案1】：

我想你要找的是and_yield:

allow(Sidekiq::Queue).to receive_message_chain(:new, :any?).and_yield(<something>)

这里有一些示例代码/规范（带有我不知道的值/方法调用），您可以自己尝试并根据需要进行更改：

class SyncTest
  def already_syncing?
    Sidekiq::Queue.new(queue_name).any? { |q| q.args[0] == car_id }
  end

  private # values for these methods below arbitrarily defined

  def queue_name
    'test'
  end

  def car_id
    1
  end
end

RSpec.describe SyncTest do
  let(:sync_test) { described_class.new }

  describe '#already_syncing?' do
    let(:queue) { double('queue') }
    let(:already_syncing) { sync_test.already_syncing? }

    before do
      # I don't have Sidekiq available for testing, so just say
      # it's a generic class.
      stub_const('Sidekiq::Queue', Class.new)
      allow(Sidekiq::Queue).to \
        receive_message_chain(:new, :any?).and_yield(queue)
    end

    context "when queue's args[0] == car_id" do
      before do
        allow(queue).to receive(:args).and_return([1])
      end

      it 'returns true' do
        expect(already_syncing).to be true
      end
    end

    context "when queue's args[0] != car_id" do
      before do
        allow(queue).to receive(:args).and_return([0])
      end

      it 'returns false' do
        expect(already_syncing).to be false
      end
    end
  end
end

【讨论】：