minitestでDelayed Job 実行中に「connection refused」で止まってしまう

###前提・実現したいこと
Railsのminitest内でDelayed Jobを実行中に「connection refused」で止まってしまう。

###発生している問題・エラーメッセージ

1) Error:
テスト名:
RuntimeError: Found DelayedJob Error: Connection refused - connect(2) for "localhost" port 9200
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:108:in `block (3 levels) in run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:205:in `capture_exceptions'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:105:in `block (2 levels) in run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:256:in `time_it'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:104:in `block in run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:331:in `on_signal'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:276:in `with_info_handler'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest/test.rb:103:in `run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:778:in `run_one_method'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:305:in `run_one_method'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:293:in `block (2 levels) in run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:292:in `each'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:292:in `block in run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:331:in `on_signal'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:318:in `with_info_handler'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:291:in `run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:152:in `block in __run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:152:in `map'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:152:in `__run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:129:in `run'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/gems/2.2.0/gems/minitest-5.8.4/lib/minitest.rb:56:in `block in autorun'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Users/username/.rbenv/versions/2.2.7/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
-e:1:in `<main>'
    test/test_helper.rb:36:in `block (2 levels) in run_delayed_jobs'
    test/test_helper.rb:32:in `block in run_delayed_jobs'
    test/test_helper.rb:31:in `times'
    test/test_helper.rb:31:in `run_delayed_jobs'
    test/features/featurename/hoge_test.rb:62:in `block (2 levels) in <top (required)>'

###該当のソースコード
test_helper.rb

Ruby
1def run_delayed_jobs(loops = 3)
2    loops.times do
3      Delayed::Job.all.each do |job|
4        next if job.run_at && job.run_at.future?
5        unless Delayed::Worker.new.run(job)
6          job = Delayed::Job.where.not(last_error: nil).order(updated_at: :desc).first
7          fail "Found DelayedJob Error: #{job.try(:last_error)}"
8        end
9      end
10    end
11  end