MDL-75759 courseformat: Fix stateactions test

* Require lib/externallib.php in
\core_courseformat\output\local\state\cm::export_for_template()
* Point @coversDefaultClass to the proper class.

course/format/classes/output/local/state/cm.php

@@ -18,6 +18,7 @@
 
 use core_courseformat\base as course_format;
 use completion_info;
+use renderer_base;
 use section_info;
 use cm_info;
 use renderable;
@@ -70,8 +71,9 @@ public function __construct(course_format $format, section_info $section, cm_inf
      * @param renderer_base $output typically, the renderer that's calling this function
      * @return stdClass data context for a mustache template
      */
-    public function export_for_template(\renderer_base $output): stdClass {
+    public function export_for_template(renderer_base $output): stdClass {
         global $USER, $CFG;
+        require_once($CFG->libdir . '/externallib.php');
 
         $format = $this->format;
         $section = $this->section;

course/format/tests/stateactions_test.php

@@ -26,7 +26,7 @@
  * @category   test
  * @copyright  2021 Sara Arjona (sara@moodle.com)
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- * @coversDefaultClass \core_course\stateactions
+ * @coversDefaultClass \core_courseformat\stateactions
  */
 class stateactions_test extends \advanced_testcase {