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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/>.
/**
 * Provides the {@link filter_mathjaxloader_filtermath_testcase} class.
 *
 * @package filter_mathjaxloader
 * @category test
 * @copyright 2018 Markku Riekkinen
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
defined('MOODLE_INTERNAL') || die();
global $CFG;
require_once($CFG->dirroot.'/filter/mathjaxloader/filter.php');
/**
 * Unit tests for the MathJax loader filter.
 *
 * @copyright 2018 Markku Riekkinen
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class filter_mathjaxloader_filtermath_testcase extends advanced_testcase {

/**
     * Test the functionality of {@link filter_mathjaxloader::filter()}.
     *
     * @param string $inputtext The text given by the user.
     * @param string $expected The expected output after filtering.
     *
     * @dataProvider test_math_filtering_inputs
     */
    public function test_math_filtering($inputtext, $expected) {
        $filter = new filter_mathjaxloader(context_system::instance(), []);
        $this->assertEquals($expected, $filter->filter($inputtext));
    }

/**
 * Data provider for {@link self::test_math_filtering()}.
 *
 * @return array of [inputtext, expectedoutput] tuples.
 */
 public function test_math_filtering_inputs() {
 return [
 // One inline formula.
 ['Some inline math \$ y = x^2 \$.',
 'Some inline math \$ y = x^2 \$.'],

// One inline and one display.
 ['Some inline math \$ y = x^2 \$ and display formula \\[ S = \\sum_{n=1}^{\\infty} 2^n \\]',
 'Some inline math \$ y = x^2 \$ and '
 . 'display formula \\[ S = \\sum_{n=1}^{\\infty} 2^n \\]'],

// One display and one inline.
 ['Display formula \\[ S = \\sum_{n=1}^{\\infty} 2^n \\] and some inline math \$ y = x^2 \$.',
 'Display formula \\[ S = \\sum_{n=1}^{\\infty} 2^n \\] and '
 . 'some inline math \$ y = x^2 \$.'],

// One inline and one display (with dollars).
 ['Some inline math \$ y = x^2 \$ and display formula $$ S = \\sum_{n=1}^{\\infty} 2^n $$',
 'Some inline math \$ y = x^2 \$ and '
 . 'display formula $$ S = \\sum_{n=1}^{\\infty} 2^n $$'],

// One display (with dollars) and one inline.
 ['Display formula $$ S = \\sum_{n=1}^{\\infty} 2^n $$ and some inline math \$ y = x^2 \$.',
 'Display formula $$ S = \\sum_{n=1}^{\\infty} 2^n $$ and '
 . 'some inline math \$ y = x^2 \$.'],

// Inline math environment nested inside display environment (using a custom LaTex macro).
 ['\\[ \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} \\] '
 . 'Text with inline formula using the custom LaTex macro \$ a = \\NullF \$.',
 ''
 . '\\[ \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} \\] '
 . 'Text with inline formula using the custom LaTex macro \$ a = \\NullF \$.'],

// Nested environments and some more content.
 ['\\[ \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} \\] '
 . 'Text with inline formula using the custom LaTex macro \$ a = \\NullF \$. Finally, a display formula '
 . '$$ b = \\NullF $$',
 ''
 . '\\[ \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} \\] '
 . 'Text with inline formula using the custom LaTex macro \$ a = \\NullF \$. '
 . 'Finally, a display formula $$ b = \\NullF $$'],

// Broken math: the delimiters ($$) are not closed.
            ['Writing text and starting display math. $$ k = i^3 \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} '
                . 'More text and inline math \$ x = \\NullF \$.',
            'Writing text and starting display math. $$ k = i^3 \\newcommand{\\False}{\\mathsf{F}} \\newcommand{\\NullF}{\\fbox{\$\\False\$}} '
                . 'More text and inline math \$ x = \\NullF \$.'],
        ];
    }
}