Example of using generator in unittests

mygenerator_test.php

<?php
class my_test_generator_testcase extends advanced_testcase {
    public function test_generator_methods() {
        global $DB;
        $this->resetAfterTest(true);

        $category = $this->getDataGenerator()->create_category();
        $course = $this->getDataGenerator()->create_course();

        $user1 = $this->getDataGenerator()->create_user();
        $user2 = $this->getDataGenerator()->create_user(array('firstname' => 'USER'));

        $teacherrole = $DB->get_record('role', array('shortname' => 'editingteacher'));
        $result = $this->getDataGenerator()->enrol_user($user1->id, $course->id, $teacherrole->id, 'manual');
        
        $block = $this->getDataGenerator()->create_block('online_users');
        
        $page = $this->getDataGenerator()->create_module('page', array('course' => $course->id));
        
        $forumgenerator = $this->getDataGenerator()->get_plugin_generator('mod_forum');
        $forum = $forumgenerator->create_instance(array('course' => $course->id));
    }
}