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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 the short answer question definition class.
*
* @package qtype_algebra
* @copyright 2017 Jean-Michel Vedrine
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
global $CFG;
require_once($CFG->dirroot . '/question/engine/tests/helpers.php');
require_once($CFG->dirroot . '/question/type/algebra/tests/helper.php');
require_once($CFG->dirroot . '/question/type/algebra/parser.php');
/**
* Unit tests for the algebra question parser.
*
* @copyright 2017 Jean-Michel Vedrine
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class qtype_algebra_parser_test extends advanced_testcase {
/**
* Test base elements of the parser
*/
public function test_parser_vars_functions() {
$p = new qtype_algebra_parser;
$expr = $p->parse('sin(2x) + cos(3y)');
$this->assertEquals(array('x', 'y'), $expr->get_variables());
$this->assertEquals(array('sin', 'cos'), $expr->get_functions());
$this->assertEquals('\sin \left( 2 x_{} \right) + \cos \left( 3 y_{} \right)', $expr->tex());
}
/**
* Test how various multiplications are displayed using TeX
*/
public function test_parser_multiply_display() {
$p = new qtype_algebra_parser;
$expr = $p->parse('sin(2x) + cos(3y)');
$this->assertEquals('\sin \left( 2 x_{} \right) + \cos \left( 3 y_{} \right)', $expr->tex());
$expr = $p->parse('sin(4 x) + cos(5 y)');
$this->assertEquals('\sin \left( 4 x_{} \right) + \cos \left( 5 y_{} \right)', $expr->tex());
$expr = $p->parse('sin(6*x) + cos(7*y)');
$this->assertEquals('\sin \left( 6 x_{} \right) + \cos \left( 7 y_{} \right)', $expr->tex());
$expr = $p->parse('3x y');
$this->assertEquals('3 x_{} y_{}', $expr->tex());
$expr = $p->parse('x*y*3');
$this->assertEquals('x_{} y_{} \times 3 ', $expr->tex());
}
}
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