I use this feed for testing apps that have to process enclosures. Have your app subscribe to the feed. Just change the value of the long number to generate a new item.

dummyPodcastFeed.xml

<?xml version="1.0"?>
<!-- RSS generated by OPML Editor v0.75 on 4/17/17; 11:19:01 PM -->
<rss version="2.0">
	<channel>
		<title>Test podcast feed</title>
		<link>http://scripting.com/</link>
		<description>This feed contains one item that has an enclosure. I have a script that rebuilds the feed with a fresh url on the enclosure making it useful for testing podcatcher apps.</description>
		<language>en-US</language>
		<lastBuildDate>Tue, 18 Apr 2017 03:19:01 GMT</lastBuildDate>
		<docs>http://cyber.law.harvard.edu/rss/rss.html</docs>
		<item>
			<title>Mr. Putin Please #21107737831492606088</title>
			<link>http://scripting.com/2017/04/15/mrPutinShowSomeMercy.mp3?num=21107737831492606088</link>
			<pubDate>Tue, 18 Apr 2017 03:19:01 GMT</pubDate>
			<guid isPermaLink="false">21107737831492606088</guid>
			<description>John McLemore's speech in Chapter V of Shit-Town.</description>
			<enclosure url="http://scripting.com/2017/04/15/mrPutinShowSomeMercy.mp3?num=21107737831492606088" type="audio/mpeg" length="905518" />
			</item>
		</channel>
	</rss>