diff --git a/lib/tests/medialib_test.php b/lib/tests/medialib_test.php
index eea80f40183..292d86ea241 100644
--- a/lib/tests/medialib_test.php
+++ b/lib/tests/medialib_test.php
@@ -347,6 +347,12 @@ class core_medialib_testcase extends advanced_testcase {
         $t = $renderer->embed_url($url);
         $this->assertContains('</iframe>', $t);
 
+        // Format: youtube video with start time.
+        $url = new moodle_url('https://www.youtube.com/watch?v=JNJMF1l3udM&t=1h11s');
+        $t = $renderer->embed_url($url);
+        $this->assertContains('</iframe>', $t);
+        $this->assertContains('start=3611', $t);
+
         // Format: youtube playlist.
         $url = new moodle_url('http://www.youtube.com/view_play_list?p=PL6E18E2927047B662');
         $t = $renderer->embed_url($url);