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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 for (some of) question/type/calculated/questiontype.php.
 *
 * @package    qtype_calculated
 * @copyright  2012 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 . '/question/type/calculated/questiontype.php');
require_once($CFG->dirroot . '/question/type/calculated/tests/helper.php');

/**
 * Unit tests for question/type/calculated/questiontype.php.
 *
 * @copyright  2012 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_calculated_test extends advanced_testcase {
    public static $includecoverage = array(
        'question/type/questiontypebase.php',
        'question/type/calculated/questiontype.php'
    );

protected $tolerance = 0.00000001;
    protected $qtype;

protected function setUp() {
        $this->qtype = new qtype_calculated();
    }

protected function tearDown() {
        $this->qtype = null;
    }

public function test_name() {
        $this->assertEquals($this->qtype->name(), 'calculated');
    }

public function test_can_analyse_responses() {
        $this->assertTrue($this->qtype->can_analyse_responses());
    }

public function test_get_random_guess_score() {
        $q = test_question_maker::get_question_data('calculated');
        $q->options->answers[17]->fraction = 0.1;
        $this->assertEquals(0.1, $this->qtype->get_random_guess_score($q));
    }

protected function get_possible_response($ans, $tolerance, $type) {
        $a = new stdClass();
        $a->answer = $ans;
        $a->tolerance = $tolerance;
        $a->tolerancetype = get_string($type, 'qtype_numerical');
        return get_string('answerwithtolerance', 'qtype_calculated', $a);
    }

public function test_get_possible_responses() {
        $q = test_question_maker::get_question_data('calculated');

$this->assertEquals(array(
            $q->id => array(
                13 => new question_possible_response(
                        $this->get_possible_response('{a} + {b}', 0.001, 'nominal'), 1.0),
                14 => new question_possible_response(
                        $this->get_possible_response('{a} - {b}', 0.001, 'nominal'), 0.0),
                17 => new question_possible_response('*', 0.0),
                null => question_possible_response::no_response()
            ),
        ), $this->qtype->get_possible_responses($q));
    }

public function test_get_possible_responses_no_star() {
        $q = test_question_maker::get_question_data('calculated');
        unset($q->options->answers[17]);

$this->assertEquals(array(
            $q->id => array(
                13 => new question_possible_response(
                        $this->get_possible_response('{a} + {b}', 0.001, 'nominal'), 1),
                14 => new question_possible_response(
                        $this->get_possible_response('{a} - {b}', 0.001, 'nominal'), 0),
                0  => new question_possible_response(
                        get_string('didnotmatchanyanswer', 'question'), 0),
                null => question_possible_response::no_response()
            ),
        ), $this->qtype->get_possible_responses($q));
    }

public function test_get_short_question_name() {
        $this->resetAfterTest();

// Enable multilang filter to on content and heading.
        filter_set_global_state('multilang', TEXTFILTER_ON);
        filter_set_applies_to_strings('multilang', 1);
        $filtermanager = filter_manager::instance();
        $filtermanager->reset_caches();

$context = context_system::instance();

$longmultilangquestionname = "Lorem ipsum dolor sit amet, consetetur sadipscing elitrLorem ipsum dolor sit amet, consetetur sadipscing elitr";
 $shortmultilangquestionname = "Lorem ipsumLorem ipsum";
 $longquestionname = "Lorem ipsum dolor sit amet, consetetur sadipscing elitr";
 $shortquestionname = "Lorem ipsum";
 $this->assertEquals("Lorem ipsum dolor...", $this->qtype->get_short_question_name($longmultilangquestionname, 20));
 $this->assertEquals("Lorem ipsum", $this->qtype->get_short_question_name($shortmultilangquestionname, 20));
 $this->assertEquals("Lorem ipsum dolor...", $this->qtype->get_short_question_name($longquestionname, 20));
 $this->assertEquals("Lorem ipsum", $this->qtype->get_short_question_name($shortquestionname, 20));
 }

public function test_placehodler_regex() {
        preg_match_all(qtype_calculated::PLACEHODLER_REGEX, '= {={a} + {b}}', $matches);
        $this->assertEquals([['{a}', '{b}'], ['a', 'b']], $matches);
    }

public function test_formulas_in_text_regex() {
        preg_match_all(qtype_calculated::FORMULAS_IN_TEXT_REGEX, '= {={a} + {b}}', $matches);
        $this->assertEquals([['{={a} + {b}}'], ['{a} + {b}']], $matches);
    }

public function test_find_dataset_names() {
        $this->assertEquals([], $this->qtype->find_dataset_names('Frog.'));

$this->assertEquals(['a' => 'a', 'b' => 'b'],
                $this->qtype->find_dataset_names('= {={a} + {b}}'));

$this->assertEquals(['a' => 'a', 'b' => 'b'],
                $this->qtype->find_dataset_names('What is {a} plus {b}? (Hint, it is not {={a}*{b}}.)'));

$this->assertEquals(['a' => 'a', 'b' => 'b', 'c' => 'c'],
 $this->qtype->find_dataset_names('
 If called with $a = {a} and $b = {b}, what does this PHP function return?
 <pre>
 /**
 * What does this do?
 */
 function mystery($a, $b) {
 return {c}*$a + $b;
 }
 </pre>
 '));
 }
}