diff --git a/mod/forum/tests/lib_test.php b/mod/forum/tests/lib_test.php
index 78450913092..e2c70988e1e 100644
--- a/mod/forum/tests/lib_test.php
+++ b/mod/forum/tests/lib_test.php
@@ -75,4 +75,85 @@ class mod_forum_lib_testcase extends advanced_testcase {
         $this->assertEventLegacyData($expected, $event);
     }
 
+    public function test_forum_get_courses_user_posted_in() {
+        $this->resetAfterTest();
+
+        $user1 = $this->getDataGenerator()->create_user();
+        $user2 = $this->getDataGenerator()->create_user();
+        $user3 = $this->getDataGenerator()->create_user();
+
+        $course1 = $this->getDataGenerator()->create_course();
+        $course2 = $this->getDataGenerator()->create_course();
+        $course3 = $this->getDataGenerator()->create_course();
+
+        // Create 3 forums, one in each course.
+        $record = new stdClass();
+        $record->course = $course1->id;
+        $forum1 = $this->getDataGenerator()->create_module('forum', $record);
+
+        $record = new stdClass();
+        $record->course = $course2->id;
+        $forum2 = $this->getDataGenerator()->create_module('forum', $record);
+
+        $record = new stdClass();
+        $record->course = $course3->id;
+        $forum3 = $this->getDataGenerator()->create_module('forum', $record);
+
+        // Add discussions to course 1 and 2 started by user1.
+        $record = new stdClass();
+        $record->course = $course1->id;
+        $record->userid = $user1->id;
+        $record->forum = $forum1->id;
+        $this->getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
+
+        $record = new stdClass();
+        $record->course = $course2->id;
+        $record->userid = $user1->id;
+        $record->forum = $forum2->id;
+        $this->getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
+
+        // Add discussions to course 3 started by user2.
+        $record = new stdClass();
+        $record->course = $course3->id;
+        $record->userid = $user2->id;
+        $record->forum = $forum3->id;
+        $discussion3 = $this->getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
+
+        // Add post to course 3 by user1.
+        $record = new stdClass();
+        $record->course = $course3->id;
+        $record->userid = $user1->id;
+        $record->forum = $forum3->id;
+        $record->discussion = $discussion3->id;
+        $this->getDataGenerator()->get_plugin_generator('mod_forum')->create_post($record);
+
+        // User 3 hasn't posted anything, so shouldn't get any results.
+        $user3courses = forum_get_courses_user_posted_in($user3);
+        $this->assertEmpty($user3courses);
+
+        // User 2 has only posted in course3.
+        $user2courses = forum_get_courses_user_posted_in($user2);
+        $this->assertCount(1, $user2courses);
+        $user2course = array_shift($user2courses);
+        $this->assertEquals($course3->id, $user2course->id);
+        $this->assertEquals($course3->shortname, $user2course->shortname);
+
+        // User 1 has posted in all 3 courses.
+        $user1courses = forum_get_courses_user_posted_in($user1);
+        $this->assertCount(3, $user1courses);
+        foreach ($user1courses as $course) {
+            $this->assertContains($course->id, array($course1->id, $course2->id, $course3->id));
+            $this->assertContains($course->shortname, array($course1->shortname, $course2->shortname,
+                $course3->shortname));
+
+        }
+
+        // User 1 has only started a discussion in course 1 and 2 though.
+        $user1courses = forum_get_courses_user_posted_in($user1, true);
+        $this->assertCount(2, $user1courses);
+        foreach ($user1courses as $course) {
+            $this->assertContains($course->id, array($course1->id, $course2->id));
+            $this->assertContains($course->shortname, array($course1->shortname, $course2->shortname));
+        }
+    }
 }