AssertQueue: An abstraction for testing background queuing in MiniTest, specifically Sidekiq

assert_queue.rb

module AssertQueue

  def assert_queued(klass, args)
    assert AssertQueue.includes?(klass, args), "Queue should contain #{klass} with args #{args.inspect}\n#{AssertQueue.queue.inspect}"
  end

  def self.included(base)
    Sidekiq::Client.instance_eval do
      def push(item)
        AssertQueue.queue.push item
      end
    end
  end

  private

  def self.queue
    @queue ||= []
  end

  def self.includes?(klass, args)
    AssertQueue.queue.any? { |item| item['class'] == klass && item['args'] == args }
  end
end

example_test.rb

class UserNoticeTest < MyApps::UnitTest
  test "queueing user notice" do
    @user = create :user
    assert_queued NoticeWorker, [:new_user, @user.id]
  end
end

Include along with your custom assertions.