title: Testing ActiveJob with Minitest doesn't hit Sidekiq queue
body: <p>On Rails 4.2 I have the following ActiveJob test :</p>
  
  <p>test/jobs/import_job_test.rb </p>
  
  <pre><code>require 'test_helper'
  
  class ImportJobTest &lt; ActiveJob::TestCase
  
    def setup
      @response = ImportJob.perform_later "'testing Sidekiq queue jobs'"
    end
  
    test "enqueued jobs" do
      assert_enqueued_jobs 1
      clear_enqueued_jobs
      assert_enqueued_jobs 0
    end
  
    test "ActiveJob::QueueAdapters::SidekiqAdapter::JobWrapper" do
      assert_equal ["'testing Sidekiq queue jobs'"], @response.arguments
    end
  
    test "a second new job has been enqueued with the given arguments" do
      assert_enqueued_jobs 1
      assert_enqueued_with(job: ImportJob, args: ["'queuing a second job'"], queue: 'default') do
        ImportJob.perform_later "'queuing a second job'"
      end
      assert_enqueued_jobs 2
    end
  
  end
  </code></pre>
  
  <p>Running the test it goes green:</p>
  
  <pre><code>$ rake test test/jobs/import_job_test.rb
  Started with run options --seed 35322
  
    4/4: [===================================] 100% Time: 00:00:00, Time: 00:00:00
  
  Finished in 0.01380s
  4 tests, 7 assertions, 0 failures, 0 errors, 0 skips
  </code></pre>
  
  <p>but never touch the Sidekiq queue really. I get green also when Sidekiq is turned off, which I don't want. Of course running in console the queue is bitten.</p>
  
  <p>How can I specify to REALLY hit the queue in test mode ?</p>