diff --git a/tests/src/Network/ProbeTest.php b/tests/src/Network/ProbeTest.php
new file mode 100644
index 0000000000..2dfc0e2ac8
--- /dev/null
+++ b/tests/src/Network/ProbeTest.php
@@ -0,0 +1,108 @@
+<?php
+
+namespace Friendica\Test\src\Network;
+
+use Friendica\Network\Probe;
+use PHPUnit\Framework\TestCase;
+
+class ProbeTest extends TestCase
+{
+	const TEMPLATENOBASE = '
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+    <title>Example Blog</title>
+    <link href="{{$link}}" rel="alternate" type="application/rss+xml" title="Example Blog" />
+	<link href="{{$link}}" rel="feed" type="application/rss+xml" title="Example Blog" />
+</head>
+<body>
+    <p>Hello World!</p>
+</body>
+</html>';
+
+	const TEMPLATEBASE = '
+<!DOCTYPE html>
+<html lang="en-us">
+<head>
+    <title>Example Blog</title>
+    <link href="{{$link}}" rel="alternate" type="application/rss+xml" title="Example Blog" />
+	<link href="{{$link}}" rel="feed" type="application/rss+xml" title="Example Blog" />
+    <base href="{{$url}}">
+</head>
+<body>
+    <p>Hello World!</p>
+</body>
+</html>';
+
+	const EXPECTED = [
+		'https://example.org/path/to/blog/index.php' => [
+			'index.xml'               => 'https://example.org/path/to/blog/index.xml',
+			'./index.xml'             => 'https://example.org/path/to/blog/index.xml',
+			'../index.xml'            => 'https://example.org/path/to/index.xml',
+			'/index.xml'              => 'https://example.org/index.xml',
+			'//example.com/index.xml' => 'https://example.com/index.xml',
+		],
+		'https://example.org/path/to/blog/' => [
+			'index.xml'               => 'https://example.org/path/to/blog/index.xml',
+			'./index.xml'             => 'https://example.org/path/to/blog/index.xml',
+			'../index.xml'            => 'https://example.org/path/to/index.xml',
+			'/index.xml'              => 'https://example.org/index.xml',
+			'//example.com/index.xml' => 'https://example.com/index.xml',
+		],
+		'https://example.org/blog/' => [
+			'index.xml'               => 'https://example.org/blog/index.xml',
+			'./index.xml'             => 'https://example.org/blog/index.xml',
+			'../index.xml'            => 'https://example.org/index.xml',
+			'/index.xml'              => 'https://example.org/index.xml',
+			'//example.com/index.xml' => 'https://example.com/index.xml',
+		],
+		'https://example.org' => [
+			'index.xml'               => 'https://example.org/index.xml',
+			'./index.xml'             => 'https://example.org/index.xml',
+			'../index.xml'            => 'https://example.org/index.xml',
+			'/index.xml'              => 'https://example.org/index.xml',
+			'//example.com/index.xml' => 'https://example.com/index.xml',
+		],
+	];
+
+	private function replaceMacros($template, $vars)
+	{
+		foreach ($vars as $var => $value) {
+			$template = str_replace('{{' . $var . '}}', $value, $template);
+		}
+
+		return $template;
+	}
+
+	/**
+	 * @small
+	 */
+	public function testGetFeedLinkNoBase()
+	{
+		foreach (self::EXPECTED as $url => $hrefs) {
+			foreach ($hrefs as $href => $expected) {
+				$body = $this->replaceMacros(self::TEMPLATENOBASE, ['$link' => $href]);
+
+				$feedLink = Probe::getFeedLink($url, $body);
+
+				$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
+			}
+		}
+	}
+
+	/**
+	 * @small
+	 */
+	public function testGetFeedLinkBase()
+	{
+		foreach (self::EXPECTED as $url => $hrefs) {
+			foreach ($hrefs as $href => $expected) {
+				$body = $this->replaceMacros(self::TEMPLATEBASE, ['$url' => $url, '$link' => $href]);
+
+				$feedLink = Probe::getFeedLink('http://example.com', $body);
+
+				$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
+			}
+		}
+	}
+}
