<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.


< /**
<  * Tests for the quiz_attempt class.
<  *
<  * @package   mod_quiz
<  * @category  test
<  * @copyright 2014 Tim Hunt
<  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
<  */



> namespace mod_quiz;
> 
> use question_engine;
> use quiz;
> use quiz_attempt;



defined('MOODLE_INTERNAL') || die();

global $CFG;
require_once($CFG->dirroot . '/mod/quiz/locallib.php');

/**
 * Tests for the quiz_attempt class.
 *

>  * @package   mod_quiz
 * @copyright 2014 Tim Hunt
>  * @category  test


 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

< class mod_quiz_attempt_testcase extends advanced_testcase {



> class attempt_test extends \advanced_testcase {



    /**
     * Create quiz and attempt data with layout.
     *
     * @param string $layout layout to set. Like quiz attempt.layout. E.g. '1,2,0,3,4,0,'.

>      * @param string $navmethod quiz navigation method (defaults to free)


     * @return quiz_attempt the new quiz_attempt object
     */

<     protected function create_quiz_and_attempt_with_layout($layout) {



>     protected function create_quiz_and_attempt_with_layout($layout, $navmethod = QUIZ_NAVMETHOD_FREE) {


        $this->resetAfterTest(true);

        // Make a user to do the quiz.
        $user = $this->getDataGenerator()->create_user();
        $course = $this->getDataGenerator()->create_course();
        // Make a quiz.
        $quizgenerator = $this->getDataGenerator()->get_plugin_generator('mod_quiz');
        $quiz = $quizgenerator->create_instance(['course' => $course->id,

<             'grade' => 100.0, 'sumgrades' => 2, 'layout' => $layout]);



>             'grade' => 100.0, 'sumgrades' => 2, 'layout' => $layout, 'navmethod' => $navmethod]);



        $quizobj = quiz::create($quiz->id, $user->id);


        $quba = question_engine::make_questions_usage_by_activity('mod_quiz', $quizobj->get_context());
        $quba->set_preferred_behaviour($quizobj->get_quiz()->preferredbehaviour);

        $questiongenerator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $questiongenerator->create_question_category();

        $page = 1;
        foreach (explode(',', $layout) as $slot) {
            if ($slot == 0) {
                $page += 1;
                continue;
            }

            $question = $questiongenerator->create_question('shortanswer', null, ['category' => $cat->id]);
            quiz_add_quiz_question($question->id, $quiz, $page);
        }

        $timenow = time();
        $attempt = quiz_create_attempt($quizobj, 1, false, $timenow, false, $user->id);
        quiz_start_new_attempt($quizobj, $quba, $attempt, 1, $timenow);
        quiz_attempt_save_started($quizobj, $quba, $attempt);

        return quiz_attempt::create($attempt->id);
    }

    public function test_attempt_url() {
        $attempt = $this->create_quiz_and_attempt_with_layout('1,2,0,3,4,0,5,6,0');

        $attemptid = $attempt->get_attempt()->id;
        $cmid = $attempt->get_cmid();
        $url = '/mod/quiz/attempt.php';
        $params = ['attempt' => $attemptid, 'cmid' => $cmid, 'page' => 2];


<         $this->assertEquals(new moodle_url($url, $params), $attempt->attempt_url(null, 2));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->attempt_url(null, 2));



        $params['page'] = 1;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->attempt_url(3));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->attempt_url(3));



        $questionattempt = $attempt->get_question_attempt(4);
        $expecteanchor = $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url($url, $params, $expecteanchor), $attempt->attempt_url(4));



>         $this->assertEquals(new \moodle_url($url, $params, $expecteanchor), $attempt->attempt_url(4));




<         $this->assertEquals(new moodle_url('#'), $attempt->attempt_url(null, 2, 2));
<         $this->assertEquals(new moodle_url('#'), $attempt->attempt_url(3, -1, 1));



>         $this->assertEquals(new \moodle_url('#'), $attempt->attempt_url(null, 2, 2));
>         $this->assertEquals(new \moodle_url('#'), $attempt->attempt_url(3, -1, 1));



        $questionattempt = $attempt->get_question_attempt(4);
        $expecteanchor = $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url(null, null, $expecteanchor, null), $attempt->attempt_url(4, -1, 1));



>         $this->assertEquals(new \moodle_url(null, null, $expecteanchor, null), $attempt->attempt_url(4, -1, 1));



        // Summary page.
        $url = '/mod/quiz/summary.php';
        unset($params['page']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->summary_url());



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->summary_url());



        // Review page.
        $url = '/mod/quiz/review.php';

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url());



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url());



        $params['page'] = 1;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(3, -1, false));
<         $this->assertEquals(new moodle_url($url, $params, $expecteanchor), $attempt->review_url(4, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(3, -1, false));
>         $this->assertEquals(new \moodle_url($url, $params, $expecteanchor), $attempt->review_url(4, -1, false));



        unset($params['page']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2, true));
<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(1, -1, true));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2, true));
>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(1, -1, true));



        $params['page'] = 2;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2, false));


        unset($params['page']);

        $params['showall'] = 0;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 0, false));
<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(1, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 0, false));
>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(1, -1, false));



        $params['page'] = 1;
        unset($params['showall']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(3, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(3, -1, false));



        $params['page'] = 2;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, -1, null, 0));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, -1, null, 0));



        $questionattempt = $attempt->get_question_attempt(3);
        $expecteanchor = '#' . $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url($expecteanchor), $attempt->review_url(3, -1, null, 0));



>         $this->assertEquals(new \moodle_url($expecteanchor), $attempt->review_url(3, -1, null, 0));



        $questionattempt = $attempt->get_question_attempt(4);
        $expecteanchor = '#' . $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url($expecteanchor), $attempt->review_url(4, -1, null, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, 2, true, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(1, -1, true, 0));
<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2, false, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, 0, false, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(1, -1, false, 0));



>         $this->assertEquals(new \moodle_url($expecteanchor), $attempt->review_url(4, -1, null, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, 2, true, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(1, -1, true, 0));
>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2, false, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, 0, false, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(1, -1, false, 0));



        $params['page'] = 1;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(3, -1, false, 0));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(3, -1, false, 0));



        // Setup another attempt.
        $attempt = $this->create_quiz_and_attempt_with_layout(
            '1,2,3,4,5,6,7,8,9,10,0,11,12,13,14,15,16,17,18,19,20,0,' .
            '21,22,23,24,25,26,27,28,29,30,0,31,32,33,34,35,36,37,38,39,40,0,' .
            '41,42,43,44,45,46,47,48,49,50,0,51,52,53,54,55,56,57,58,59,60,0');

        $attemptid = $attempt->get_attempt()->id;
        $cmid = $attempt->get_cmid();
        $params = ['attempt' => $attemptid, 'cmid' => $cmid];

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url());



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url());



        $params['page'] = 2;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2));



        $params['page'] = 1;
        unset($params['showall']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(11, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(11, -1, false));



        $questionattempt = $attempt->get_question_attempt(12);
        $expecteanchor = $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url($url, $params, $expecteanchor), $attempt->review_url(12, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params, $expecteanchor), $attempt->review_url(12, -1, false));



        $params['showall'] = 1;
        unset($params['page']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2, true));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2, true));




<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(1, -1, true));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(1, -1, true));


        $params['page'] = 2;
        unset($params['showall']);

<         $this->assertEquals(new moodle_url($url, $params),  $attempt->review_url(null, 2, false));



>         $this->assertEquals(new \moodle_url($url, $params),  $attempt->review_url(null, 2, false));


        unset($params['page']);

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 0, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 0, false));


        $params['page'] = 1;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(11, -1, false));
<         $this->assertEquals(new moodle_url($url, $params, $expecteanchor), $attempt->review_url(12, -1, false));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(11, -1, false));
>         $this->assertEquals(new \moodle_url($url, $params, $expecteanchor), $attempt->review_url(12, -1, false));


        $params['page'] = 2;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, -1, null, 0));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, -1, null, 0));



        $questionattempt = $attempt->get_question_attempt(3);
        $expecteanchor = $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url(null, null, $expecteanchor), $attempt->review_url(3, -1, null, 0));



>         $this->assertEquals(new \moodle_url(null, null, $expecteanchor), $attempt->review_url(3, -1, null, 0));



        $questionattempt = $attempt->get_question_attempt(4);
        $expecteanchor = $questionattempt->get_outer_question_div_unique_id();

<         $this->assertEquals(new moodle_url(null, null, $expecteanchor), $attempt->review_url(4, -1, null, 0));



>         $this->assertEquals(new \moodle_url(null, null, $expecteanchor), $attempt->review_url(4, -1, null, 0));




<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, 2, true, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(1, -1, true, 0));



>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, 2, true, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(1, -1, true, 0));



        $params['page'] = 2;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(null, 2, false, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(null, 0, false, 0));
<         $this->assertEquals(new moodle_url('#'), $attempt->review_url(1, -1, false, 0));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(null, 2, false, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(null, 0, false, 0));
>         $this->assertEquals(new \moodle_url('#'), $attempt->review_url(1, -1, false, 0));



        $params['page'] = 1;

<         $this->assertEquals(new moodle_url($url, $params), $attempt->review_url(11, -1, false, 0));



>         $this->assertEquals(new \moodle_url($url, $params), $attempt->review_url(11, -1, false, 0));


    }

    /**
     * Tests attempt page titles when all questions are on a single page.
     */
    public function test_attempt_titles_single() {
        $attempt = $this->create_quiz_and_attempt_with_layout('1,2,0');

        // Attempt page.
        $this->assertEquals('Quiz 1', $attempt->attempt_page_title(0));

        // Summary page.
        $this->assertEquals('Quiz 1: Attempt summary', $attempt->summary_page_title());

        // Review page.
        $this->assertEquals('Quiz 1: Attempt review', $attempt->review_page_title(0));
    }

    /**
     * Tests attempt page titles when questions are on multiple pages, but are reviewed on a single page.
     */
    public function test_attempt_titles_multiple_single() {
        $attempt = $this->create_quiz_and_attempt_with_layout('1,2,0,3,4,0,5,6,0');

        // Attempt page.
        $this->assertEquals('Quiz 1 (page 1 of 3)', $attempt->attempt_page_title(0));
        $this->assertEquals('Quiz 1 (page 2 of 3)', $attempt->attempt_page_title(1));
        $this->assertEquals('Quiz 1 (page 3 of 3)', $attempt->attempt_page_title(2));

        // Summary page.
        $this->assertEquals('Quiz 1: Attempt summary', $attempt->summary_page_title());

        // Review page.
        $this->assertEquals('Quiz 1: Attempt review', $attempt->review_page_title(0, true));
    }

    /**
     * Tests attempt page titles when questions are on multiple pages, and they are reviewed on multiple pages as well.
     */
    public function test_attempt_titles_multiple_multiple() {
        $attempt = $this->create_quiz_and_attempt_with_layout(
                '1,2,3,4,5,6,7,8,9,10,0,11,12,13,14,15,16,17,18,19,20,0,' .
                '21,22,23,24,25,26,27,28,29,30,0,31,32,33,34,35,36,37,38,39,40,0,' .
                '41,42,43,44,45,46,47,48,49,50,0,51,52,53,54,55,56,57,58,59,60,0');

        // Attempt page.
        $this->assertEquals('Quiz 1 (page 1 of 6)', $attempt->attempt_page_title(0));
        $this->assertEquals('Quiz 1 (page 2 of 6)', $attempt->attempt_page_title(1));
        $this->assertEquals('Quiz 1 (page 6 of 6)', $attempt->attempt_page_title(5));

        // Summary page.
        $this->assertEquals('Quiz 1: Attempt summary', $attempt->summary_page_title());

        // Review page.
        $this->assertEquals('Quiz 1: Attempt review (page 1 of 6)', $attempt->review_page_title(0));
        $this->assertEquals('Quiz 1: Attempt review (page 2 of 6)', $attempt->review_page_title(1));
        $this->assertEquals('Quiz 1: Attempt review (page 6 of 6)', $attempt->review_page_title(5));

        // When all questions are shown.
        $this->assertEquals('Quiz 1: Attempt review', $attempt->review_page_title(0, true));
        $this->assertEquals('Quiz 1: Attempt review', $attempt->review_page_title(1, true));
    }

    public function test_is_participant() {
        global $USER;
        $this->resetAfterTest();
        $this->setAdminUser();
        $course = $this->getDataGenerator()->create_course();
        $student = $this->getDataGenerator()->create_and_enrol($course, 'student');
        $student2 = $this->getDataGenerator()->create_and_enrol($course, 'student', [], 'manual', 0, 0, ENROL_USER_SUSPENDED);
        $quiz = $this->getDataGenerator()->create_module('quiz', array('course' => $course->id));
        $quizobj = quiz::create($quiz->id);

        // Login as student.
        $this->setUser($student);
        // Convert to a lesson object.
        $this->assertEquals(true, $quizobj->is_participant($student->id),
            'Student is enrolled, active and can participate');

        // Login as student2.
        $this->setUser($student2);
        $this->assertEquals(false, $quizobj->is_participant($student2->id),
            'Student is enrolled, suspended and can NOT participate');

        // Login as an admin.
        $this->setAdminUser();
        $this->assertEquals(false, $quizobj->is_participant($USER->id),
            'Admin is not enrolled and can NOT participate');

        $this->getDataGenerator()->enrol_user(2, $course->id);
        $this->assertEquals(true, $quizobj->is_participant($USER->id),
            'Admin is enrolled and can participate');

        $this->getDataGenerator()->enrol_user(2, $course->id, [], 'manual', 0, 0, ENROL_USER_SUSPENDED);
        $this->assertEquals(true, $quizobj->is_participant($USER->id),
            'Admin is enrolled, suspended and can participate');
    }

    /**
     * Test quiz_prepare_and_start_new_attempt function
     */
    public function test_quiz_prepare_and_start_new_attempt() {
        global $USER;
        $this->resetAfterTest();

        // Create course.
        $course = $this->getDataGenerator()->create_course();
        // Create students.
        $student1 = $this->getDataGenerator()->create_and_enrol($course, 'student');
        $student2 = $this->getDataGenerator()->create_and_enrol($course, 'student');
        // Create quiz.
        $quizgenerator = $this->getDataGenerator()->get_plugin_generator('mod_quiz');
        $quiz = $quizgenerator->create_instance(['course' => $course->id, 'grade' => 100.0, 'sumgrades' => 2, 'layout' => '1,0']);
        // Create question and add it to quiz.
        $questiongenerator = $this->getDataGenerator()->get_plugin_generator('core_question');
        $cat = $questiongenerator->create_question_category();
        $question = $questiongenerator->create_question('shortanswer', null, ['category' => $cat->id]);
        quiz_add_quiz_question($question->id, $quiz, 1);

        $quizobj = quiz::create($quiz->id);

        // Login as student1.
        $this->setUser($student1);
        // Create attempt for student1.
        $attempt = quiz_prepare_and_start_new_attempt($quizobj, 1, null, false, [], []);
        $this->assertEquals($student1->id, $attempt->userid);
        $this->assertEquals(0, $attempt->preview);

        // Login as student2.
        $this->setUser($student2);
        // Create attempt for student2.
        $attempt = quiz_prepare_and_start_new_attempt($quizobj, 1, null, false, [], []);
        $this->assertEquals($student2->id, $attempt->userid);
        $this->assertEquals(0, $attempt->preview);

        // Login as admin.
        $this->setAdminUser();
        // Create attempt for student1.
        $attempt = quiz_prepare_and_start_new_attempt($quizobj, 2, null, false, [], [], $student1->id);
        $this->assertEquals($student1->id, $attempt->userid);
        $this->assertEquals(0, $attempt->preview);
        $student1attempt = $attempt; // Save for extra verification below.
        // Create attempt for student2.
        $attempt = quiz_prepare_and_start_new_attempt($quizobj, 2, null, false, [], [], $student2->id);
        $this->assertEquals($student2->id, $attempt->userid);
        $this->assertEquals(0, $attempt->preview);
        // Create attempt for user id that the same with current $USER->id.
        $attempt = quiz_prepare_and_start_new_attempt($quizobj, 2, null, false, [], [], $USER->id);
        $this->assertEquals($USER->id, $attempt->userid);
        $this->assertEquals(1, $attempt->preview);

        // Check that the userid stored in the first step is the user the attempt is for,
        // not the user who triggered the creation.
        $quba = question_engine::load_questions_usage_by_activity($student1attempt->uniqueid);
        $step = $quba->get_question_attempt(1)->get_step(0);
        $this->assertEquals($student1->id, $step->get_user_id());

>     }
    }
> 
}
>     /**
>      * Test check_page_access function
>      * @covers \quiz_attempt::check_page_access
>      */
>     public function test_check_page_access() {
>         $timenow = time();
> 
>         // Free navigation.
>         $attempt = $this->create_quiz_and_attempt_with_layout('1,0,2,0,3,0,4,0,5,0', QUIZ_NAVMETHOD_FREE);
> 
>         // Check access.
>         $this->assertTrue($attempt->check_page_access(4));
>         $this->assertTrue($attempt->check_page_access(3));
>         $this->assertTrue($attempt->check_page_access(2));
>         $this->assertTrue($attempt->check_page_access(1));
>         $this->assertTrue($attempt->check_page_access(0));
>         $this->assertTrue($attempt->check_page_access(2));
> 
>         // Access page 2.
>         $attempt->set_currentpage(2);
>         $attempt = quiz_attempt::create($attempt->get_attempt()->id);
> 
>         // Check access.
>         $this->assertTrue($attempt->check_page_access(0));
>         $this->assertTrue($attempt->check_page_access(1));
>         $this->assertTrue($attempt->check_page_access(2));
>         $this->assertTrue($attempt->check_page_access(3));
>         $this->assertTrue($attempt->check_page_access(4));
> 
>         // Sequential navigation.
>         $attempt = $this->create_quiz_and_attempt_with_layout('1,0,2,0,3,0,4,0,5,0', QUIZ_NAVMETHOD_SEQ);
> 
>         // Check access.
>         $this->assertTrue($attempt->check_page_access(0));
>         $this->assertTrue($attempt->check_page_access(1));
>         $this->assertFalse($attempt->check_page_access(2));
>         $this->assertFalse($attempt->check_page_access(3));
>         $this->assertFalse($attempt->check_page_access(4));
> 
>         // Access page 1.
>         $attempt->set_currentpage(1);
>         $attempt = quiz_attempt::create($attempt->get_attempt()->id);
>         $this->assertTrue($attempt->check_page_access(1));
> 
>         // Access page 2.
>         $attempt->set_currentpage(2);
>         $attempt = quiz_attempt::create($attempt->get_attempt()->id);
>         $this->assertTrue($attempt->check_page_access(2));
> 
>         $this->assertTrue($attempt->check_page_access(3));
>         $this->assertFalse($attempt->check_page_access(4));
>         $this->assertFalse($attempt->check_page_access(1));