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<?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/>.

/**
 * Unit tests.
 *
 * @package filter_activitynames
 * @category test
 * @copyright 2018 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

global $CFG;
require_once($CFG->dirroot . '/filter/activitynames/filter.php'); // Include the code to test.

/**
 * Test case for the activity names auto-linking filter.
 *
 * @copyright 2018 The Open University
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class filter_activitynames_filter_testcase extends advanced_testcase {

public function test_links() {
        $this->resetAfterTest(true);

// Create a test course.
        $course = $this->getDataGenerator()->create_course();
        $context = context_course::instance($course->id);

// Create two pages that will be linked to.
        $page1 = $this->getDataGenerator()->create_module('page',
                ['course' => $course->id, 'name' => 'Test 1']);
        $page2 = $this->getDataGenerator()->create_module('page',
                ['course' => $course->id, 'name' => 'Test (2)']);

// Format text with all three entries in HTML.
 $html = 'Please read the two pages Test 1 and Test (2).';
 $filtered = format_text($html, FORMAT_HTML, array('context' => $context));

// Find all the glossary links in the result.
 $matches = [];
 preg_match_all('~<a class="autolink" title="([^"]*)" href="[^"]*/mod/page/view.php\?id=([0-9]+)">([^<]*)</a>~',
 $filtered, $matches);

// There should be 2 links links.
        $this->assertCount(2, $matches[1]);

// Check text of title attribute.
        $this->assertEquals($page1->name, $matches[1][0]);
        $this->assertEquals($page2->name, $matches[1][1]);

// Check the ids in the links.
        $this->assertEquals($page1->cmid, $matches[2][0]);
        $this->assertEquals($page2->cmid, $matches[2][1]);

// Check the link text.
        $this->assertEquals($page1->name, $matches[3][0]);
        $this->assertEquals($page2->name, $matches[3][1]);
    }

public function test_links_activity_named_hyphen() {
        $this->resetAfterTest(true);

// Create a test course.
        $course = $this->getDataGenerator()->create_course();
        $context = context_course::instance($course->id);

// Work around an issue with the activity names filter which maintains a static cache
        // of activities for current course ID. We can re-build the cache by switching user.
        $this->setUser($this->getDataGenerator()->create_user());

// Create a page activity named '-' (single hyphen).
        $page = $this->getDataGenerator()->create_module('page', ['course' => $course->id, 'name' => '-']);

$html = 'Please read the - page.';
 $filtered = format_text($html, FORMAT_HTML, array('context' => $context));

// Find the page link in the filtered html.
 preg_match_all('~<a class="autolink" title="([^"]*)" href="[^"]*/mod/page/view.php\?id=([0-9]+)">([^<]*)</a>~',
 $filtered, $matches);

// We should have exactly one match.
        $this->assertCount(1, $matches[1]);

$this->assertEquals($page->name, $matches[1][0]);
        $this->assertEquals($page->cmid, $matches[2][0]);
        $this->assertEquals($page->name, $matches[3][0]);
    }
}