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/>.

namespace quiz_statistics;

use question_attempt;

use question_bank;

use question_finder;

use quiz_statistics_report;

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

global $CFG;

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

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

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

/**

 * Quiz attempt walk through using data from csv file.

 *

 * The quiz stats below and the question stats found in qstats00.csv were calculated independently in a spreadsheet which is

 * available in open document or excel format here :

 * https://github.com/jamiepratt/moodle-quiz-tools/tree/master/statsspreadsheet

 *

 * Similarly the question variant's stats in qstats00.csv are calculated in stats_for_variant_1.xls and stats_for_variant_8.xls

 * The calculations in the spreadsheets are the same as for the other question stats but applied just to the attempts where the

 * variants appeared.

 *

 * @package    quiz_statistics

 * @category   test

 * @copyright  2013 The Open University

 * @author     Jamie Pratt <me@jamiep.org>

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

 */

class stats_from_steps_walkthrough_test extends \mod_quiz\attempt_walkthrough_from_csv_test {

    /**

     * @var quiz_statistics_report object to do stats calculations.

     */

    protected $report;

    protected function get_full_path_of_csv_file(string $setname, string $test): string {

        // Overridden here so that __DIR__ points to the path of this file.

        return  __DIR__."/fixtures/{$setname}{$test}.csv";

    }

    /**

     * @var string[] names of the files which contain the test data.

     */

    protected $files = ['questions', 'steps', 'results', 'qstats', 'responsecounts'];

    /**

     * Create a quiz add questions to it, walk through quiz attempts and then check results.

     *

     * @param array $csvdata data read from csv file "questionsXX.csv", "stepsXX.csv" and "resultsXX.csv".

     * @dataProvider get_data_for_walkthrough

     */

    public function test_walkthrough_from_csv($quizsettings, $csvdata) {

        $this->create_quiz_simulate_attempts_and_check_results($quizsettings, $csvdata);

        $whichattempts = QUIZ_GRADEAVERAGE; // All attempts.

        $whichtries = question_attempt::ALL_TRIES;

        $groupstudentsjoins = new \core\dml\sql_join();

        list($questions, $quizstats, $questionstats, $qubaids) =

                    $this->check_stats_calculations_and_response_analysis($csvdata,

                            $whichattempts, $whichtries, $groupstudentsjoins);

        if ($quizsettings['testnumber'] === '00') {

            $this->check_variants_count_for_quiz_00($questions, $questionstats, $whichtries, $qubaids);

            $this->check_quiz_stats_for_quiz_00($quizstats);

        }

    }

    /**

     * Check actual question stats are the same as that found in csv file.

     *

     * @param $qstats         array data from csv file.

     * @param $questionstats  \core_question\statistics\questions\all_calculated_for_qubaid_condition Calculated stats.

     */

    protected function check_question_stats($qstats, $questionstats) {

        foreach ($qstats as $slotqstats) {

            foreach ($slotqstats as $statname => $slotqstat) {

                if (!in_array($statname, ['slot', 'subqname'])  && $slotqstat !== '') {

                    $this->assert_stat_equals($slotqstat,

                                              $questionstats,

                                              $slotqstats['slot'],

                                              $slotqstats['subqname'],

                                              $slotqstats['variant'],

                                              $statname);

                }

            }

            // Check that sub-question boolean field is correctly set.

            $this->assert_stat_equals(!empty($slotqstats['subqname']),

                                      $questionstats,

                                      $slotqstats['slot'],

                                      $slotqstats['subqname'],

                                      $slotqstats['variant'],

                                      'subquestion');

        }

    }

    /**

     * Check that the stat is as expected within a reasonable tolerance.

     *

     * @param float|string|bool $expected expected value of stat.

     * @param \core_question\statistics\questions\all_calculated_for_qubaid_condition $questionstats

     * @param int $slot

     * @param string $subqname if empty string then not an item stat.

     * @param int|string $variant if empty string then not a variantstat.

     * @param string $statname

     */

    protected function assert_stat_equals($expected, $questionstats, $slot, $subqname, $variant, $statname) {

        if ($variant === '' && $subqname === '') {

            $actual = $questionstats->for_slot($slot)->{$statname};

        } else if ($subqname !== '') {

            $actual = $questionstats->for_subq($this->randqids[$slot][$subqname])->{$statname};

        } else {

            $actual = $questionstats->for_slot($slot, $variant)->{$statname};

        }

        $message = "$statname for slot $slot";

        if ($expected === '**NULL**') {

            $this->assertEquals(null, $actual, $message);

        } else if (is_bool($expected)) {

            $this->assertEquals($expected, $actual, $message);

        } else if (is_numeric($expected)) {

            switch ($statname) {

                case 'covariance' :

                case 'discriminationindex' :

                case 'discriminativeefficiency' :

                case 'effectiveweight' :

                    $precision = 1e-5;

                    break;

                default :

                    $precision = 1e-6;

            }

            $delta = abs($expected) * $precision;

            $this->assertEqualsWithDelta((float)$expected, $actual, $delta, $message);

        } else {

            $this->assertEquals($expected, $actual, $message);

        }

    }

    protected function assert_response_count_equals($question, $qubaids, $expected, $whichtries) {

        $responesstats = new \core_question\statistics\responses\analyser($question);

        $analysis = $responesstats->load_cached($qubaids, $whichtries);

        if (!isset($expected['subpart'])) {

            $subpart = 1;

        } else {

            $subpart = $expected['subpart'];

        }

        list($subpartid, $responseclassid) = $this->get_response_subpart_and_class_id($question,

                                                                                      $subpart,

                                                                                      $expected['modelresponse']);

        $subpartanalysis = $analysis->get_analysis_for_subpart($expected['variant'], $subpartid);

        $responseclassanalysis = $subpartanalysis->get_response_class($responseclassid);

        $actualresponsecounts = $responseclassanalysis->data_for_question_response_table('', '');

        foreach ($actualresponsecounts as $actualresponsecount) {

            if ($actualresponsecount->response == $expected['actualresponse'] || count($actualresponsecounts) == 1) {

                $i = 1;

                $partofanalysis = " slot {$expected['slot']}, rand q '{$expected['randq']}', variant {$expected['variant']}, ".

                                    "for expected model response {$expected['modelresponse']}, ".

                                    "actual response {$expected['actualresponse']}";

                while (isset($expected['count'.$i])) {

                    if ($expected['count'.$i] != 0) {

                        $this->assertTrue(isset($actualresponsecount->trycount[$i]),

                            "There is no count at all for try $i on ".$partofanalysis);

                        $this->assertEquals($expected['count'.$i], $actualresponsecount->trycount[$i],

                                            "Count for try $i on ".$partofanalysis);

                    }

                    $i++;

                }

                if (isset($expected['totalcount'])) {

                    $this->assertEquals($expected['totalcount'], $actualresponsecount->totalcount,

                                        "Total count on ".$partofanalysis);

                }

                return;

            }

        }

        throw new \coding_exception("Expected response '{$expected['actualresponse']}' not found.");

    }

    protected function get_response_subpart_and_class_id($question, $subpart, $modelresponse) {

        $qtypeobj = question_bank::get_qtype($question->qtype, false);

        $possibleresponses = $qtypeobj->get_possible_responses($question);

        $possibleresponsesubpartids = array_keys($possibleresponses);

        if (!isset($possibleresponsesubpartids[$subpart - 1])) {

            throw new \coding_exception("Subpart '{$subpart}' not found.");

        }

        $subpartid = $possibleresponsesubpartids[$subpart - 1];

        if ($modelresponse == '[NO RESPONSE]') {

            return [$subpartid, null];

        } else if ($modelresponse == '[NO MATCH]') {

            return [$subpartid, 0];

        }

        $modelresponses = [];

        foreach ($possibleresponses[$subpartid] as $responseclassid => $subpartpossibleresponse) {

            $modelresponses[$responseclassid] = $subpartpossibleresponse->responseclass;

        }

        $this->assertContains($modelresponse, $modelresponses);

        $responseclassid = array_search($modelresponse, $modelresponses);

        return [$subpartid, $responseclassid];

    }

    /**

     * @param $responsecounts

     * @param $qubaids

     * @param $questions

     * @param $whichtries

     */

    protected function check_response_counts($responsecounts, $qubaids, $questions, $whichtries) {

        foreach ($responsecounts as $expected) {

            $defaultsforexpected = ['randq' => '', 'variant' => '1', 'subpart' => '1'];

            foreach ($defaultsforexpected as $key => $expecteddefault) {

                if (!isset($expected[$key])) {

                    $expected[$key] = $expecteddefault;

                }

            }

            if ($expected['randq'] == '') {

                $question = $questions[$expected['slot']];

            } else {

                $qid = $this->randqids[$expected['slot']][$expected['randq']];

                $question = question_finder::get_instance()->load_question_data($qid);

            }

            $this->assert_response_count_equals($question, $qubaids, $expected, $whichtries);

        }

    }

    /**

     * @param $questions

     * @param $questionstats

     * @param $whichtries

     * @param $qubaids

     */

    protected function check_variants_count_for_quiz_00($questions, $questionstats, $whichtries, $qubaids) {

        $expectedvariantcounts = [2 => [1  => 6,

                                                  4  => 4,

                                                  5  => 3,

                                                  6  => 4,

                                                  7  => 2,

                                                  8  => 5,

                                                  10 => 1]];

        foreach ($questions as $slot => $question) {

            if (!question_bank::get_qtype($question->qtype, false)->can_analyse_responses()) {

                continue;

            }

            $responesstats = new \core_question\statistics\responses\analyser($question);

            $this->assertTimeCurrent($responesstats->get_last_analysed_time($qubaids, $whichtries));

            $analysis = $responesstats->load_cached($qubaids, $whichtries);

            $variantsnos = $analysis->get_variant_nos();

            if (isset($expectedvariantcounts[$slot])) {

                // Compare contents, ignore ordering of array, using canonicalize parameter of assertEquals.

                $this->assertEqualsCanonicalizing(array_keys($expectedvariantcounts[$slot]), $variantsnos);

            } else {

                $this->assertEquals([1], $variantsnos);

            }

            $totalspervariantno = [];

            foreach ($variantsnos as $variantno) {

                $subpartids = $analysis->get_subpart_ids($variantno);

                foreach ($subpartids as $subpartid) {

                    if (!isset($totalspervariantno[$subpartid])) {

                        $totalspervariantno[$subpartid] = [];

                    }

                    $totalspervariantno[$subpartid][$variantno] = 0;

                    $subpartanalysis = $analysis->get_analysis_for_subpart($variantno, $subpartid);

                    $classids = $subpartanalysis->get_response_class_ids();

                    foreach ($classids as $classid) {

                        $classanalysis = $subpartanalysis->get_response_class($classid);

                        $actualresponsecounts = $classanalysis->data_for_question_response_table('', '');

                        foreach ($actualresponsecounts as $actualresponsecount) {

                            $totalspervariantno[$subpartid][$variantno] += $actualresponsecount->totalcount;

                        }

                    }

                }

            }

            // Count all counted responses for each part of question and confirm that counted responses, for most question types

            // are the number of attempts at the question for each question part.

            if ($slot != 5) {

                // Slot 5 holds a multi-choice multiple question.

                // Multi-choice multiple is slightly strange. Actual answer counts given for each sub part do not add up to the

                // total attempt count.

                // This is because each option is counted as a sub part and each option can be off or on in each attempt. Off is

                // not counted in response analysis for this question type.

                foreach ($totalspervariantno as $totalpervariantno) {

                    if (isset($expectedvariantcounts[$slot])) {

                        // If we know how many attempts there are at each variant we can check

                        // that we have counted the correct amount of responses for each variant.

                        $this->assertEqualsCanonicalizing($expectedvariantcounts[$slot],

                                            $totalpervariantno,

                                            "Totals responses do not add up in response analysis for slot {$slot}.");

                    } else {

                        $this->assertEquals(25,

                                            array_sum($totalpervariantno),

                                            "Totals responses do not add up in response analysis for slot {$slot}.");

                    }

                }

            }

        }

        foreach ($expectedvariantcounts as $slot => $expectedvariantcount) {

            foreach ($expectedvariantcount as $variantno => $s) {

                $this->assertEquals($s, $questionstats->for_slot($slot, $variantno)->s);

            }

        }

    }

    /**

     * @param $quizstats

     */

    protected function check_quiz_stats_for_quiz_00($quizstats) {

        $quizstatsexpected = [

            'median'             => 4.5,

            'firstattemptsavg'   => 4.617333332,

            'allattemptsavg'     => 4.617333332,

            'firstattemptscount' => 25,

            'allattemptscount'   => 25,

            'standarddeviation'  => 0.8117265554,

            'skewness'           => -0.092502502,

            'kurtosis'           => -0.7073968557,

            'cic'                => -87.2230935542,

            'errorratio'         => 136.8294900795,

            'standarderror'      => 1.1106813066

        ];

        foreach ($quizstatsexpected as $statname => $statvalue) {

            $this->assertEqualsWithDelta($statvalue, $quizstats->$statname, abs($statvalue) * 1.5e-5, $quizstats->$statname);

        }

    }

    /**

     * Check the question stats and the response counts used in the statistics report. If the appropriate files exist in fixtures/.

     *

     * @param array $csvdata Data loaded from csv files for this test.

     * @param string $whichattempts

     * @param string $whichtries

     * @param \core\dml\sql_join $groupstudentsjoins

     * @return array with contents 0 => $questions, 1 => $quizstats, 2 => $questionstats, 3 => $qubaids Might be needed for further

     *               testing.

     */

    protected function check_stats_calculations_and_response_analysis($csvdata, $whichattempts, $whichtries,

            \core\dml\sql_join $groupstudentsjoins) {

        $this->report = new quiz_statistics_report();

        $questions = $this->report->load_and_initialise_questions_for_calculations($this->quiz);

        list($quizstats, $questionstats) = $this->report->get_all_stats_and_analysis($this->quiz,

                                                                                     $whichattempts,

                                                                                     $whichtries,

                                                                                     $groupstudentsjoins,

                                                                                     $questions);

        $qubaids = quiz_statistics_qubaids_condition($this->quiz->id, $groupstudentsjoins, $whichattempts);

        // We will create some quiz and question stat calculator instances and some response analyser instances, just in order

        // to check the last analysed time then returned.

        $quizcalc = new calculator();

        // Should not be a delay of more than one second between the calculation of stats above and here.

        $this->assertTimeCurrent($quizcalc->get_last_calculated_time($qubaids));

        $qcalc = new \core_question\statistics\questions\calculator($questions);

        $this->assertTimeCurrent($qcalc->get_last_calculated_time($qubaids));

        if (isset($csvdata['responsecounts'])) {

            $this->check_response_counts($csvdata['responsecounts'], $qubaids, $questions, $whichtries);

        }

        if (isset($csvdata['qstats'])) {

            $this->check_question_stats($csvdata['qstats'], $questionstats);

            return [$questions, $quizstats, $questionstats, $qubaids];

        }

        return [$questions, $quizstats, $questionstats, $qubaids];

    }

}