[Summary view]

Differences Between: [Versions 310 and 403] [Versions 311 and 403] [Versions 39 and 403]

   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  namespace core_question;
  18  
  19  use core_question\engine\variants\least_used_strategy;
  20  use qubaid_list;
  21  use question_bank;
  22  use question_engine;
  23  
  24  defined('MOODLE_INTERNAL') || die();
  25  
  26  global $CFG;
  27  require_once($CFG->dirroot . '/question/engine/tests/helpers.php');
  28  
  29  /**
  30   * Tests for the {@link core_question\engine\variants\least_used_strategy} class.
  31   *
  32   * @package    core_question
  33   * @copyright  2015 The Open University
  34   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  35   */
  36  class least_used_variant_strategy_test extends \advanced_testcase {
  37  
  38      public function test_question_with_one_variant_always_picks_that() {
  39          $question = \test_question_maker::make_question('shortanswer');
  40          $quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
  41          $quba->set_preferred_behaviour('deferredfeedback');
  42          $slot = $quba->add_question($question);
  43          $quba->start_all_questions(new least_used_strategy(
  44                  $quba, new qubaid_list([])));
  45          $this->assertEquals(1, $quba->get_variant($slot));
  46      }
  47  
  48      public function test_synchronised_question_should_use_the_same_dataset() {
  49          // Actually, we cheat here. We use the same question twice, not two different synchronised questions.
  50          $question = \test_question_maker::make_question('calculated');
  51          $quba = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
  52          $quba->set_preferred_behaviour('deferredfeedback');
  53          $slot1 = $quba->add_question($question);
  54          $slot2 = $quba->add_question($question);
  55          $quba->start_all_questions(new least_used_strategy(
  56                  $quba, new qubaid_list([])));
  57          $this->assertEquals($quba->get_variant($slot1), $quba->get_variant($slot2));
  58      }
  59  
  60      public function test_second_attempt_uses_other_dataset() {
  61          global $DB;
  62          $this->resetAfterTest();
  63          $generator = $this->getDataGenerator()->get_plugin_generator('core_question');
  64  
  65          $cat = $generator->create_question_category();
  66          $questiondata = $generator->create_question('calculated', null, ['category' => $cat->id]);
  67  
  68          // Create two dataset items.
  69          $adefinitionid = $DB->get_field_sql("
  70                      SELECT qdd.id
  71                        FROM {question_dataset_definitions} qdd
  72                        JOIN {question_datasets} qd ON qd.datasetdefinition = qdd.id
  73                       WHERE qd.question = ?
  74                         AND qdd.name = ?", [$questiondata->id, 'a']);
  75          $bdefinitionid = $DB->get_field_sql("
  76                      SELECT qdd.id
  77                        FROM {question_dataset_definitions} qdd
  78                        JOIN {question_datasets} qd ON qd.datasetdefinition = qdd.id
  79                       WHERE qd.question = ?
  80                         AND qdd.name = ?", [$questiondata->id, 'b']);
  81          $DB->set_field('question_dataset_definitions', 'itemcount', 2, ['id' => $adefinitionid]);
  82          $DB->set_field('question_dataset_definitions', 'itemcount', 2, ['id' => $bdefinitionid]);
  83          $DB->insert_record('question_dataset_items', ['definition' => $adefinitionid,
  84                  'itemnumber' => 1, 'value' => 3]);
  85          $DB->insert_record('question_dataset_items', ['definition' => $bdefinitionid,
  86                  'itemnumber' => 1, 'value' => 7]);
  87          $DB->insert_record('question_dataset_items', ['definition' => $adefinitionid,
  88                  'itemnumber' => 2, 'value' => 6]);
  89          $DB->insert_record('question_dataset_items', ['definition' => $bdefinitionid,
  90                  'itemnumber' => 2, 'value' => 4]);
  91  
  92          $question = question_bank::load_question($questiondata->id);
  93  
  94          $quba1 = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
  95          $quba1->set_preferred_behaviour('deferredfeedback');
  96          $slot1 = $quba1->add_question($question);
  97          $quba1->start_all_questions(new least_used_strategy(
  98                  $quba1, new qubaid_list([])));
  99          question_engine::save_questions_usage_by_activity($quba1);
 100          $variant1 = $quba1->get_variant($slot1);
 101  
 102          // Second attempt should use the other variant.
 103          $quba2 = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
 104          $quba2->set_preferred_behaviour('deferredfeedback');
 105          $slot2 = $quba2->add_question($question);
 106          $quba2->start_all_questions(new least_used_strategy(
 107                  $quba1, new qubaid_list([$quba1->get_id()])));
 108          question_engine::save_questions_usage_by_activity($quba2);
 109          $variant2 = $quba2->get_variant($slot2);
 110  
 111          $this->assertNotEquals($variant1, $variant2);
 112  
 113          // Third attempt uses either variant at random.
 114          $quba3 = question_engine::make_questions_usage_by_activity('test', \context_system::instance());
 115          $quba3->set_preferred_behaviour('deferredfeedback');
 116          $slot3 = $quba3->add_question($question);
 117          $quba3->start_all_questions(new least_used_strategy(
 118                  $quba1, new qubaid_list([$quba1->get_id(), $quba2->get_id()])));
 119          $variant3 = $quba3->get_variant($slot3);
 120  
 121          $this->assertTrue($variant3 == $variant1 || $variant3 == $variant2);
 122      }
 123  }