Add Errno::EHOSTUNREACH to Podcasts's rescue list (forem#16884)

* Add Errno::EHOSTUNREACH to Podcasts's rescue list

* Add spec

app/services/podcasts/feed.rb

@@ -26,7 +26,7 @@ def get_episodes(limit: 100, force_update: false)
       end
       podcast.update_columns(reachable: true, status_notice: "")
       feed.items.size
-    rescue Net::OpenTimeout, Errno::ECONNREFUSED, SocketError, HTTParty::RedirectionTooDeep
+    rescue Net::OpenTimeout, Errno::ECONNREFUSED, Errno::EHOSTUNREACH, SocketError, HTTParty::RedirectionTooDeep
       set_unreachable(status: :unreachable, force_update: force_update)
     rescue OpenSSL::SSL::SSLError
       set_unreachable(status: :ssl_failed, force_update: force_update)

spec/services/podcasts/feed_spec.rb

@@ -35,6 +35,15 @@
       expect(unpodcast.status_notice).to include("is not reachable")
     end
 
+    it "sets reachable when hitting ip issue" do
+      allow(HTTParty).to receive(:get).with("http://podcast.example.com/podcast", httparty_options).and_raise(
+        Errno::EHOSTUNREACH,
+      )
+      described_class.new(unpodcast).get_episodes(limit: 2)
+      unpodcast.reload
+      expect(unpodcast.reachable).to be false
+    end
+
     it "sets reachable when there redirection is too deep" do
       allow(HTTParty).to receive(:get).with("http://podcast.example.com/podcast", httparty_options).and_raise(
         HTTParty::RedirectionTooDeep, "too deep"