MDL-66899 quiz: Adding test for regrading quiz event.

mod/quiz/tests/events_test.php

@@ -749,4 +749,40 @@ class mod_quiz_events_testcase extends advanced_testcase {
         $this->assertEventLegacyLogData($expected, $event);
         $this->assertEventContextNotUsed($event);
     }
+
+    /**
+     * Test the attempt regraded event.
+     *
+     * There is no external API for regrading attempts, so the unit test will simply
+     * create and trigger the event and ensure the event data is returned as expected.
+     */
+    public function test_attempt_regraded() {
+      $this->resetAfterTest();
+
+      $this->setAdminUser();
+      $course = $this->getDataGenerator()->create_course();
+      $quiz = $this->getDataGenerator()->create_module('quiz', array('course' => $course->id));
+
+      $params = array(
+        'objectid' => 1,
+        'relateduserid' => 2,
+        'courseid' => $course->id,
+        'context' => context_module::instance($quiz->cmid),
+        'other' => array(
+          'quizid' => $quiz->id
+        )
+      );
+      $event = \mod_quiz\event\attempt_regraded::create($params);
+
+      // Trigger and capture the event.
+      $sink = $this->redirectEvents();
+      $event->trigger();
+      $events = $sink->get_events();
+      $event = reset($events);
+
+      // Check that the event data is valid.
+      $this->assertInstanceOf('\mod_quiz\event\attempt_regraded', $event);
+      $this->assertEquals(context_module::instance($quiz->cmid), $event->get_context());
+      $this->assertEventContextNotUsed($event);
+    }
 }