<p>Currently we get warnings when running the tests:</p>
<pre><code>DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from <top (required)> at /home/andy/src/openstreetmap-website/config/application.rb:17)
</code></pre>
<p>As far as I can tell, this is being triggered by one or other of these two gems:</p>
<ul>
<li><a href="https://github.com/oauth-xx/oauth-ruby/blob/e397b3e2f540faaebd7912aeb2768835d151f795/lib/oauth/client/action_controller_request.rb#L21">oauth</a></li>
<li><a href="https://github.com/mperham/deadlock_retry/blob/874c80de92d9eb30405536916aff86f616649b01/lib/deadlock_retry.rb#L8">deadlock_retry</a></li>
</ul>
<p>In both cases there's not yet a newer version to upgrade to. The method <a href="https://github.com/rails/rails/commit/7c848e6dd493ff236d33a0410a92f4c3e5cc3c7f">has been removed in rails 5.1</a> so I think this is blocking any upgrade.</p>

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