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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 select missing words question edit form.
 *
 * @package   qtype_gapselect
 * @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($CFG->dirroot . '/question/engine/tests/helpers.php');
require_once($CFG->dirroot . '/question/type/edit_question_form.php');
require_once($CFG->dirroot . '/question/type/gapselect/edit_gapselect_form.php');

/**
 * Subclass of qtype_gapselect_edit_form_base that is easier to used in unit tests.
 *
 * @copyright 2012 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_gapselect_edit_form_base_testable extends qtype_gapselect_edit_form_base {
    public function get_illegal_tag_error($text) {
        return parent::get_illegal_tag_error($text);
    }

/**
     * Set the list of allowed tags.
     * @param array $allowed
     */
    public function set_allowed_tags(array $allowed) {
        $this->allowedhtmltags = $allowed;
    }
}

/**
 * Unit tests for select missing words question edit form.
 *
 * @copyright  2012 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_gapselect_edit_form_test extends advanced_testcase {

/**
     * Helper method.
     *
     * @param string $classname the question form class to instantiate.
     *
     *
     * @return array with two elements:
     *      question_edit_form great a question form instance that can be tested.
     *      stdClass the question category.
     */
    protected function get_form($classname) {
        $this->setAdminUser();
        $this->resetAfterTest();

$syscontext = context_system::instance();
        $category = question_make_default_categories(array($syscontext));
        $fakequestion = new stdClass();
        $fakequestion->qtype = 'gapselect'; // Does not actually matter if this is wrong.
        $fakequestion->contextid = $syscontext->id;
        $fakequestion->createdby = 2;
        $fakequestion->category = $category->id;
        $fakequestion->questiontext = 'Test [[1]] question [[2]]';
        $fakequestion->options = new stdClass();
        $fakequestion->options->answers = array();
        $fakequestion->formoptions = new stdClass();
        $fakequestion->formoptions->movecontext = null;
        $fakequestion->formoptions->repeatelements = true;
        $fakequestion->inputs = null;

$form = new $classname(new moodle_url('/'), $fakequestion, $category,
                new question_edit_contexts($syscontext));

return [$form, $category];
    }

public function test_get_illegal_tag_error() {
        list($form) = $this->get_form('qtype_gapselect_edit_form_base_testable');

$this->assertEquals('', $form->get_illegal_tag_error('frog'));
 $this->assertEquals('', $form->get_illegal_tag_error('toad'));

$a = new stdClass();
 $a->tag = '<ijk>';
 $a->allowed = ', , , , , , ';
 $this->assertEquals(get_string('tagsnotallowed', 'qtype_gapselect', $a), $form->get_illegal_tag_error('<ijk>'));

$a->tag = '</cat>';
 $this->assertEquals(get_string('tagsnotallowed', 'qtype_gapselect', $a), $form->get_illegal_tag_error('</cat>'));

$a->tag = ' ';
 $this->assertEquals(get_string('tagsnotallowed', 'qtype_gapselect', $a), $form->get_illegal_tag_error(' '));

$form->set_allowed_tags(array());

$this->assertEquals('', $form->get_illegal_tag_error('frog'));

$a->tag = '';
 $this->assertEquals(get_string('tagsnotallowedatall', 'qtype_gapselect', $a),
 $form->get_illegal_tag_error('toad'));

$a->tag = '<ijk>';
 $this->assertEquals(get_string('tagsnotallowedatall', 'qtype_gapselect', $a),
 $form->get_illegal_tag_error('<ijk>'));

$a->tag = '</cat>';
 $this->assertEquals(get_string('tagsnotallowedatall', 'qtype_gapselect', $a),
 $form->get_illegal_tag_error('</cat>'));

$a->tag = '';
 $this->assertEquals(get_string('tagsnotallowedatall', 'qtype_gapselect', $a),
 $form->get_illegal_tag_error(' '));
 }

/**
     * Test the form shows the right number of groups of choices.
     */
    public function test_number_of_choice_groups() {
        list($form) = $this->get_form('qtype_gapselect_edit_form');
        // Use reflection to get the protected property we need.
        $property = new ReflectionProperty('qtype_gapselect_edit_form', '_form');
        $property->setAccessible(true);
        $mform = $property->getValue($form);
        $choices = $mform->getElement('choices[0]');
        $groupoptions = $choices->_elements[1];
        $this->assertCount(20, $groupoptions->_options);
    }

/**
     * Test the form correctly validates the HTML allowed in choices.
     */
    public function test_choices_validation() {
        list($form, $category) = $this->get_form('qtype_gapselect_edit_form');

$submitteddata = [
 'category' => $category->id,
 'questiontext' => ['text' => 'Test [[1]] question [[2]]', 'format' => FORMAT_HTML],
 'choices' => [
 ['answer' => 'frog'],
 ['answer' => 'toad'],
 ],
 ];

$errors = $form->validation($submitteddata, []);

$this->assertArrayNotHasKey('choices[0]', $errors);
 $this->assertEquals(' is not allowed. (No HTML is allowed here.)',
 $errors['choices[1]']);
 }
}