Proyectos de Subversion Moodle

<?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/engine/statistics.php

 *

 * @package   quiz_statistics

 * @category  test

 * @copyright 2008 Jamie Pratt

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

namespace quiz_statistics;

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

global $CFG;

require_once($CFG->libdir . '/questionlib.php');

require_once($CFG->dirroot . '/mod/quiz/locallib.php');

require_once($CFG->dirroot . '/mod/quiz/report/reportlib.php');

class testable_all_calculated_for_qubaid_condition extends \core_question\statistics\questions\all_calculated_for_qubaid_condition {

    /**

     * Disabling caching in tests so we are always sure to force the calculation of stats right then and there.

     *

     * @param qubaid_condition $qubaids

     */

    public function cache($qubaids) {

    }

}

/**

 * Test helper subclass of question_statistics

 *

 * @copyright 2010 The Open University

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class testable_question_statistics extends \core_question\statistics\questions\calculator {

    /**

     * @var stdClass[]

     */

    protected $lateststeps;

    protected $statscollectionclassname = '\quiz_statistics\testable_all_calculated_for_qubaid_condition';

    public function set_step_data($states) {

        $this->lateststeps = $states;

    }

    protected function get_random_guess_score($questiondata) {

        return 0;

    }

    /**

     * @param $qubaids qubaid_condition is ignored in this test

     * @return array with two items

     *              - $lateststeps array of latest step data for the question usages

     *              - $summarks    array of total marks for each usage, indexed by usage id

     */

    protected function get_latest_steps($qubaids) {

        $summarks = [];

        $fakeusageid = 0;

        foreach ($this->lateststeps as $step) {

            // The same 'sumgrades' field is available in step data for every slot, we will ignore all slots but slot 1.

            // The step for slot 1 is always the first one in the csv file for each usage, we will use that to separate steps from

            // each usage.

            if ($step->slot == 1) {

                $fakeusageid++;

                $summarks[$fakeusageid] = $step->sumgrades;

            }

            unset($step->sumgrades);

            $step->questionusageid = $fakeusageid;

        }

        return [$this->lateststeps, $summarks];

    }

    protected function cache_stats($qubaids) {

        // No caching wanted for tests.

    }

}

/**

 * Unit tests for (some of) question_statistics.

 *

 * @copyright 2008 Jamie Pratt

 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class statistics_test extends \basic_testcase {

    /** @var testable_all_calculated_for_qubaid_condition object created to test class. */

    protected $qstats;

    public function test_qstats() {

        global $CFG;

        // Data is taken from randomly generated attempts data generated by

        // contrib/tools/generators/qagenerator/.

        $steps = $this->get_records_from_csv(__DIR__.'/fixtures/mdl_question_states.csv');

        // Data is taken from questions mostly generated by

        // contrib/tools/generators/generator.php.

        $questions = $this->get_records_from_csv(__DIR__.'/fixtures/mdl_question.csv');

        $calculator = new testable_question_statistics($questions);

        $calculator->set_step_data($steps);

        $this->qstats = $calculator->calculate(null);

        // Values expected are taken from contrib/tools/quiz_tools/stats.xls.

        $facility = [0, 0, 0, 0, null, null, null, 41.19318182, 81.36363636,

            71.36363636, 65.45454545, 65.90909091, 36.36363636, 59.09090909, 50,

            59.09090909, 63.63636364, 45.45454545, 27.27272727, 50];

        $this->qstats_q_fields('facility', $facility, 100);

        $sd = [0, 0, 0, 0, null, null, null, 1912.733589, 251.2738111,

            322.6312277, 333.4199022, 337.5811591, 492.3659639, 503.2362797,

            511.7663157, 503.2362797, 492.3659639, 509.6471914, 455.8423058, 511.7663157];

        $this->qstats_q_fields('sd', $sd, 1000);

        $effectiveweight = [0, 0, 0, 0, 0, 0, 0, 26.58464457, 3.368456046,

            3.253955259, 7.584083694, 3.79658376, 3.183278505, 4.532356904,

            7.78856243, 10.08351572, 8.381139345, 8.727645713, 7.946277111, 4.769500946];

        $this->qstats_q_fields('effectiveweight', $effectiveweight);

        $discriminationindex = [null, null, null, null, null, null, null,

            25.88327077, 1.170256965, -4.207816809, 28.16930644, -2.513606859,

            -12.99017581, -8.900638238, 8.670004606, 29.63337745, 15.18945843,

            16.21079629, 15.52451404, -8.396734802];

        $this->qstats_q_fields('discriminationindex', $discriminationindex);

        $discriminativeefficiency = [null, null, null, null, null, null, null,

            27.23492723, 1.382386552, -4.691171307, 31.12404354, -2.877487579,

            -17.5074184, -10.27568922, 10.86956522, 34.58997279, 17.4790556,

            20.14359793, 22.06477733, -10];

        $this->qstats_q_fields('discriminativeefficiency', $discriminativeefficiency);

    }

    public function qstats_q_fields($fieldname, $values, $multiplier=1) {

        foreach ($this->qstats->get_all_slots() as $slot) {

            $value = array_shift($values);

            if ($value !== null) {

                $this->assertEqualsWithDelta($value, $this->qstats->for_slot($slot)->{$fieldname} * $multiplier, 1E-6);

            } else {

                $this->assertEquals($value, $this->qstats->for_slot($slot)->{$fieldname} * $multiplier);

            }

        }

    }

    public function get_fields_from_csv($line) {

        $line = trim($line);

        $items = preg_split('!,!', $line);

        $cnt = count($items);

        for ($key = 0; $key < $cnt; $key++) {

            if ($items[$key]!='') {

                if ($start = ($items[$key][0]=='"')) {

                    $items[$key] = substr($items[$key], 1);

                    while (!$end = ($items[$key][strlen($items[$key])-1]=='"')) {

                        $item = $items[$key];

                        unset($items[$key]);

                        $key++;

                        $items[$key] = $item . ',' . $items[$key];

                    }

                    $items[$key] = substr($items[$key], 0, strlen($items[$key])-1);

                }

            }

        }

        return $items;

    }

    public function get_records_from_csv($filename) {

        $filecontents = file($filename, FILE_IGNORE_NEW_LINES);

        $records = [];

        // Skip the first line containing field names.

        $keys = $this->get_fields_from_csv(array_shift($filecontents));

        while (null !== ($line = array_shift($filecontents))) {

            $data = $this->get_fields_from_csv($line);

            $arraykey = reset($data);

            $object = new \stdClass();

            foreach ($keys as $key) {

                $value = array_shift($data);

                if ($value !== null) {

                    $object->{$key} = $value;

                } else {

                    $object->{$key} = '';

                }

            }

            $records[$arraykey] = $object;

        }

        return $records;

    }

}