<?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 qtype_ddwtos;

use question_display_options;
use question_hint_with_parts;
use question_state;

defined('MOODLE_INTERNAL') || die();
global $CFG;

require_once($CFG->dirroot . '/question/engine/tests/helpers.php');
require_once($CFG->dirroot . '/question/type/ddwtos/tests/helper.php');


/**
 * Unit tests for the drag-and-drop words into sentences question type.
 *
 * @package   qtype_ddwtos
 * @copyright 2012 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
final class walkthrough_test extends \qbehaviour_walkthrough_test_base {

    protected function get_contains_drop_box_expectation($place, $group, $readonly,
            $stateclass = '0') {
        $qa = $this->quba->get_question_attempt($this->slot);

        $class = "place{$place} drop group{$group}";
        if ($readonly) {
            $class .= ' readonly';
        } else {
            $expectedattrs['tabindex'] = 0;
        }
        $expectedattrs['class'] = $class;

        return new \question_contains_tag_with_attributes('span', $expectedattrs);
    }

    public function test_interactive_behaviour(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->hints = array(
            new question_hint_with_parts(13, 'This is the first hint.', FORMAT_HTML, false, false),
            new question_hint_with_parts(14, 'This is the second hint.', FORMAT_HTML, true, true),
        );
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'interactive', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_no_hint_visible_expectation());

        // Save the wrong answer.
        $this->process_submission(array('p1' => '2', 'p2' => '2', 'p3' => '2'));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '2'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '2'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '2'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_no_hint_visible_expectation());

        // Submit the wrong answer.
        $this->process_submission(array('p1' => '2', 'p2' => '2', 'p3' => '2', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true),
                $this->get_contains_drop_box_expectation('2', 2, true),
                $this->get_contains_drop_box_expectation('3', 3, true),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_try_again_button_expectation(true),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_contains_hint_expectation('This is the first hint'));

        // Do try again.
        $this->process_submission(array('-tryagain' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '2'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '2'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '2'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(2),
                $this->get_no_hint_visible_expectation());

        // Submit the right answer.
        $this->process_submission(array('p1' => '1', 'p2' => '1', 'p3' => '1', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(2);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'correct'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'correct'),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_correct_expectation(),
                $this->get_no_hint_visible_expectation());

        // Check regrading does not mess anything up.
        $this->quba->regrade_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(2);
    }

    public function test_deferred_feedback(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'deferredfeedback', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_feedback_expectation());

        // Save a partial answer.
        $this->process_submission(array('p1' => '1', 'p2' => '2'));

        // Verify.
        $this->check_current_state(question_state::$invalid);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '2'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());

        // Save the right answer.
        $this->process_submission(array('p1' => '1', 'p2' => '1', 'p3' => '1'));

        // Verify.
        $this->check_current_state(question_state::$complete);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '1'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());

        // Finish the attempt.
        $this->quba->finish_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(3);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'correct'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'correct'),
                $this->get_contains_correct_expectation());

        // Change the right answer a bit.
        $dd->rightchoices[2] = 2;

        // Check regrading does not mess anything up.
        $this->quba->regrade_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedpartial);
        $this->check_current_mark(2);
    }

    public function test_deferred_feedback_unanswered(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'deferredfeedback', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());
        $this->check_step_count(1);

        // Save a blank response.
        $this->process_submission(array('p1' => '0', 'p2' => '0', 'p3' => '0'));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());
        $this->check_step_count(1);

        // Finish the attempt.
        $this->quba->finish_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gaveup);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true),
                $this->get_contains_drop_box_expectation('2', 2, true),
                $this->get_contains_drop_box_expectation('3', 3, true));
    }

    public function test_deferred_feedback_partial_answer(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'deferredfeedback', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());

        // Save a partial response.
        $this->process_submission(array('p1' => '1', 'p2' => '0', 'p3' => '0'));

        // Verify.
        $this->check_current_state(question_state::$invalid);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());

        // Finish the attempt.
        $this->quba->finish_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedpartial);
        $this->check_current_mark(1);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'incorrect'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'incorrect'),
                $this->get_contains_partcorrect_expectation());
    }

    public function test_interactive_grading(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->hints = array(
            new question_hint_with_parts(1, 'This is the first hint.',
                    FORMAT_MOODLE, true, true),
            new question_hint_with_parts(2, 'This is the second hint.',
                    FORMAT_MOODLE, true, true),
        );
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'interactive', 9);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->assertEquals('interactivecountback',
                $this->quba->get_question_attempt($this->slot)->get_behaviour_name());
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_does_not_contain_num_parts_correct(),
                $this->get_no_hint_visible_expectation());

        // Submit an response with the first two parts right.
        $this->process_submission(array('p1' => '1', 'p2' => '1', 'p3' => '2', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true),
                $this->get_contains_drop_box_expectation('2', 2, true),
                $this->get_contains_drop_box_expectation('3', 3, true),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_try_again_button_expectation(true),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_contains_hint_expectation('This is the first hint'),
                $this->get_contains_num_parts_correct(2),
                $this->get_contains_standard_partiallycorrect_combined_feedback_expectation(),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'));

        // Check that extract responses will return the reset data.
        $prefix = $this->quba->get_field_prefix($this->slot);
        $this->assertEquals(array('p1' => '1', 'p2' => '1'),
                $this->quba->extract_responses($this->slot,
                array($prefix . 'p1' => '1', $prefix . 'p2' => '1', '-tryagain' => 1)));

        // Do try again.
        $this->process_submission(array('p1' => '1', 'p2' => '1', '-tryagain' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_try_again_button_expectation(),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(2),
                $this->get_no_hint_visible_expectation());

        // Submit an response with the first and last parts right.
        $this->process_submission(array('p1' => '1', 'p2' => '2', 'p3' => '1', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true),
                $this->get_contains_drop_box_expectation('2', 2, true),
                $this->get_contains_drop_box_expectation('3', 3, true),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_try_again_button_expectation(true),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_contains_hint_expectation('This is the second hint'),
                $this->get_contains_num_parts_correct(2),
                $this->get_contains_standard_partiallycorrect_combined_feedback_expectation(),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '1'));

        // Do try again.
        $this->process_submission(array('p1' => '1', 'p3' => '1', '-tryagain' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '1'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_try_again_button_expectation(),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(1),
                $this->get_no_hint_visible_expectation());

        // Submit the right answer.
        $this->process_submission(array('p1' => '1', 'p2' => '1', 'p3' => '1', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(6);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'correct'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'correct'),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_does_not_contain_try_again_button_expectation(),
                $this->get_contains_correct_expectation(),
                $this->get_no_hint_visible_expectation(),
                $this->get_does_not_contain_num_parts_correct(),
                $this->get_contains_standard_correct_combined_feedback_expectation(),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '1'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '1'));
    }

    public function test_interactive_correct_no_submit(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->hints = array(
            new question_hint_with_parts(23, 'This is the first hint.',
                    FORMAT_MOODLE, false, false),
            new question_hint_with_parts(24, 'This is the second hint.',
                    FORMAT_MOODLE, true, true),
        );
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'interactive', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_no_hint_visible_expectation());

        // Save the right answer.
        $this->process_submission(array('p1' => '1', 'p2' => '1', 'p3' => '1'));

        // Finish the attempt without clicking check.
        $this->quba->finish_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(3);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'correct'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'correct'),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_correct_expectation(),
                $this->get_no_hint_visible_expectation());

        // Check regrading does not mess anything up.
        $this->quba->regrade_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(3);
    }

    public function test_interactive_partial_no_submit(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->hints = array(
            new question_hint_with_parts(23, 'This is the first hint.',
                    FORMAT_MOODLE, false, false),
            new question_hint_with_parts(24, 'This is the second hint.',
                    FORMAT_MOODLE, true, true),
        );
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'interactive', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_no_hint_visible_expectation());

        // Save the a partially right answer.
        $this->process_submission(array('p1' => '1', 'p2' => '2', 'p3' => '2'));

        // Finish the attempt without clicking check.
        $this->quba->finish_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedpartial);
        $this->check_current_mark(1);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'incorrect'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'incorrect'),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_partcorrect_expectation(),
                $this->get_no_hint_visible_expectation());

        // Check regrading does not mess anything up.
        $this->quba->regrade_all_questions();

        // Verify.
        $this->check_current_state(question_state::$gradedpartial);
        $this->check_current_mark(1);
    }

    public function test_interactive_no_right_clears(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $dd->hints = array(
            new question_hint_with_parts(23, 'This is the first hint.', FORMAT_MOODLE, false, true),
            new question_hint_with_parts(24, 'This is the second hint.', FORMAT_MOODLE, true, true),
        );
        $dd->shufflechoices = false;
        $this->start_attempt_at_question($dd, 'interactive', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_marked_out_of_summary(),
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(3),
                $this->get_no_hint_visible_expectation());

        // Save the a completely wrong answer.
        $this->process_submission(array('p1' => '2', 'p2' => '2', 'p3' => '2', '-submit' => 1));

        // Verify.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_marked_out_of_summary(),
                $this->get_contains_drop_box_expectation('1', 1, true),
                $this->get_contains_drop_box_expectation('2', 2, true),
                $this->get_contains_drop_box_expectation('3', 3, true),
                $this->get_does_not_contain_submit_button_expectation(),
                $this->get_contains_hint_expectation('This is the first hint'));

        // Do try again.
        $this->process_submission(array('p1' => '0', 'p2' => '0', 'p3' => '0', '-tryagain' => 1));

        // Check that all the wrong answers have been cleared.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_marked_out_of_summary(),
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_contains_submit_button_expectation(true),
                $this->get_does_not_contain_feedback_expectation(),
                $this->get_tries_remaining_expectation(2),
                $this->get_no_hint_visible_expectation());
    }

    public function test_display_of_right_answer_when_shuffled(): void {

        // Create a drag-and-drop question.
        $dd = \test_question_maker::make_question('ddwtos');
        $this->start_attempt_at_question($dd, 'deferredfeedback', 3);

        // Check the initial state.
        $this->check_current_state(question_state::$todo);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2', '0'),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3', '0'),
                $this->get_does_not_contain_feedback_expectation());

        // Save a partial answer.
        $this->process_submission($dd->get_correct_response());

        // Verify.
        $this->check_current_state(question_state::$complete);
        $this->check_current_mark(null);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, false),
                $this->get_contains_drop_box_expectation('2', 2, false),
                $this->get_contains_drop_box_expectation('3', 3, false),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p1',
                                $dd->get_right_choice_for(1)),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p2',
                                $dd->get_right_choice_for(2)),
                $this->get_contains_hidden_expectation(
                        $this->quba->get_field_prefix($this->slot) . 'p3',
                                $dd->get_right_choice_for(3)),
                $this->get_does_not_contain_correctness_expectation(),
                $this->get_does_not_contain_feedback_expectation());

        // Finish the attempt.
        $this->quba->finish_all_questions();

        // Verify.
        $this->displayoptions->rightanswer = question_display_options::VISIBLE;
        $this->assertEquals('{quick} {fox} {lazy}', $dd->get_right_answer_summary());
        $this->check_current_state(question_state::$gradedright);
        $this->check_current_mark(3);
        $this->check_current_output(
                $this->get_contains_drop_box_expectation('1', 1, true, 'correct'),
                $this->get_contains_drop_box_expectation('2', 2, true, 'correct'),
                $this->get_contains_drop_box_expectation('3', 3, true, 'correct'),
                $this->get_contains_correct_expectation(),
                new \question_pattern_expectation('/' .
                        preg_quote('The [quick] brown [fox] jumped over the [lazy] dog.', '/') . '/'));
    }
}
