refactor: FeedExpander::parseItem() descendants (#3744)

bridges/FeedExpanderTestBridge.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+class FeedExpanderTestBridge extends FeedExpander
+{
+    const MAINTAINER = 'No maintainer';
+    const NAME = 'Unnamed bridge';
+    const URI = 'https://esdf.com/';
+    const DESCRIPTION = 'No description provided';
+    const PARAMETERS = [];
+    const CACHE_TIMEOUT = 3600;
+
+    public function collectData()
+    {
+        $url = 'http://static.userland.com/gems/backend/sampleRss.xml'; // rss 0.91
+        //$url = 'http://feeds.nature.com/nature/rss/current?format=xml'; // rss 1.0
+        //$url = 'https://dvikan.no/feed.xml'; // rss 2.0
+        //$url = 'https://nedlasting.geonorge.no/geonorge/Tjenestefeed.xml'; // atom
+
+        $this->collectExpandableDatas($url);
+    }
+}