MDL-56549 media_html5audio: Add test for native extensions support.

This is to verify that all files of html_audio mime type extensions are
passing list_supported_urls method correctly.

media/player/html5audio/tests/player_test.php

@@ -60,7 +60,7 @@ public function test_is_installed() {
     /**
      * Test method get_supported_extensions()
      */
-    public function test_supported_extensions() {
+    public function test_get_supported_extensions() {
         global $CFG;
         require_once($CFG->libdir . '/filelib.php');
 
@@ -72,6 +72,25 @@ public function test_supported_extensions() {
         $this->assertEmpty(array_diff($nativeextensions, $player->get_supported_extensions()));
     }
 
+    /**
+     * Test method list_supported_urls()
+     */
+    public function test_list_supported_urls() {
+        global $CFG;
+        require_once($CFG->libdir . '/filelib.php');
+
+        $nativeextensions = file_get_typegroup('extension', 'html_audio');
+
+        // Create list of URLs for each extension.
+        $urls = array_map(function($ext){
+            return new moodle_url('http://example.org/audio.' . $ext);
+        }, $nativeextensions);
+
+        // Make sure that the list of supported URLs is not filtering permitted extensions.
+        $player = new media_html5audio_plugin();
+        $this->assertCount(count($urls), $player->list_supported_urls($urls));
+    }
+
     /**
      * Test embedding without media filter (for example for displaying file resorce).
      */