<?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 Moodle XML format.
 *
 * @package    qformat_xml
 * @copyright  2010 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->libdir . '/questionlib.php');
require_once($CFG->dirroot . '/question/format/xml/format.php');
require_once($CFG->dirroot . '/question/engine/tests/helpers.php');


/**
 * Unit tests for the matching question definition class.
 *
 * @copyright  2009 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qformat_xml_test extends question_testcase {
    public function assert_same_xml($expectedxml, $xml) {
        $this->assertEquals(str_replace("\r\n", "\n", $expectedxml),
                str_replace("\r\n", "\n", $xml));
    }

    public function make_test_question() {
        global $USER;
        $q = new stdClass();
        $q->id = 0;
        $q->contextid = 0;
        $q->idnumber = null;
        $q->category = 0;
        $q->parent = 0;
        $q->questiontextformat = FORMAT_HTML;
        $q->generalfeedbackformat = FORMAT_HTML;
        $q->defaultmark = 1;
        $q->penalty = 0.3333333;
        $q->length = 1;
        $q->stamp = make_unique_id_code();
        $q->version = make_unique_id_code();
        $q->hidden = 0;
        $q->timecreated = time();
        $q->timemodified = time();
        $q->createdby = $USER->id;
        $q->modifiedby = $USER->id;
        return $q;
    }

    /**
     * The data the XML import format sends to save_question is not exactly
     * the same as the data returned from the editing form, so this method
     * makes necessary changes to the return value of
     * test_question_maker::get_question_form_data so that the tests can work.
     * @param object $expectedq as returned by get_question_form_data.
     * @return object one more likely to match the return value of import_...().
     */
    public function remove_irrelevant_form_data_fields($expectedq) {
        return $this->itemid_to_files($expectedq);
    }

    /**
     * Becuase XML import uses a files array instead of an itemid integer to
     * handle saving files with a question, we need to covert the output of
     * test_question_maker::get_question_form_data to match. This method recursively
     * replaces all array elements with key itemid with an array entry with
     * key files and value an empty array.
     *
     * @param mixed $var any data structure.
     * @return mixed an equivalent structure with the relacements made.
     */
    protected function itemid_to_files($var) {
        if (is_object($var)) {
            $newvar = new stdClass();
            foreach (get_object_vars($var) as $field => $value) {
                $newvar->$field = $this->itemid_to_files($value);
            }

        } else if (is_array($var)) {
            $newvar = array();
            foreach ($var as $index => $value) {
                if ($index === 'itemid') {
                    $newvar['files'] = array();
                } else {
                    $newvar[$index] = $this->itemid_to_files($value);
                }
            }

        } else {
            $newvar = $var;
        }

        return $newvar;
    }

    public function test_xml_escape_simple_input_not_escaped() {
        $exporter = new qformat_xml();
        $string = 'Nothing funny here. Even if we go to a café or to 日本.';
        $this->assertEquals($string, $exporter->xml_escape($string));
    }

    public function test_xml_escape_html_wrapped_in_cdata() {
        $exporter = new qformat_xml();
        $string = '<p>Nothing <b>funny<b> here. Even if we go to a café or to 日本.</p>';
        $this->assertEquals('<![CDATA[' . $string . ']]>', $exporter->xml_escape($string));
    }

    public function test_xml_escape_script_tag_handled_ok() {
        $exporter = new qformat_xml();
        $input = '<script><![CDATA[alert(1<2);]]></script>';
        $expected = '<![CDATA[<script><![CDATA[alert(1<2);]]]]><![CDATA[></script>]]>';
        $this->assertEquals($expected, $exporter->xml_escape($input));

        // Check that parsing the expected result does give the input again.
        $parsed = simplexml_load_string('<div>' . $expected . '</div>');
        $this->assertEquals($input, $parsed->xpath('//div')[0]);
    }

    public function test_xml_escape_code_that_looks_like_cdata_end_ok() {
        $exporter = new qformat_xml();
        $input = "if (x[[0]]>a) print('hah');";
        $expected = "<![CDATA[if (x[[0]]]]><![CDATA[>a) print('hah');]]>";
        $this->assertEquals($expected, $exporter->xml_escape($input));

        // Check that parsing the expected result does give the input again.
        $parsed = simplexml_load_string('<div>' . $expected . '</div>');
        $this->assertEquals($input, $parsed->xpath('//div')[0]);
    }

    public function test_write_hint_basic() {
        $q = $this->make_test_question();
        $q->contextid = \context_system::instance()->id;
        $q->name = 'Short answer question';
        $q->questiontext = 'Name an amphibian: __________';
        $q->generalfeedback = 'Generalfeedback: frog or toad would have been OK.';
        if (!isset($q->options)) {
            $q->options = new stdClass();
        }
        $q->options->usecase = false;
        $q->options->answers = array(
            13 => new question_answer(13, 'frog', 1.0, 'Frog is a very good answer.', FORMAT_HTML),
            14 => new question_answer(14, 'toad', 0.8, 'Toad is an OK good answer.', FORMAT_HTML),
            15 => new question_answer(15, '*', 0.0, 'That is a bad answer.', FORMAT_HTML),
        );
        $q->qtype = 'shortanswer';
        $q->hints = array(
            new question_hint(0, 'This is the first hint.', FORMAT_MOODLE),
        );

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($q);

        $this->assertRegExp('|<hint format=\"moodle_auto_format\">\s*<text>\s*' .
                'This is the first hint\.\s*</text>\s*</hint>|', $xml);
        $this->assertNotRegExp('|<shownumcorrect/>|', $xml);
        $this->assertNotRegExp('|<clearwrong/>|', $xml);
        $this->assertNotRegExp('|<options>|', $xml);
    }

    public function test_write_hint_with_parts() {
        $q = $this->make_test_question();
        $q->contextid = \context_system::instance()->id;
        $q->name = 'Matching question';
        $q->questiontext = 'Classify the animals.';
        $q->generalfeedback = 'Frogs and toads are amphibians, the others are mammals.';
        $q->qtype = 'match';

        if (!isset($q->options)) {
            $q->options = new stdClass();
        }
        $q->options->shuffleanswers = 1;
        $q->options->correctfeedback = '';
        $q->options->correctfeedbackformat = FORMAT_HTML;
        $q->options->partiallycorrectfeedback = '';
        $q->options->partiallycorrectfeedbackformat = FORMAT_HTML;
        $q->options->incorrectfeedback = '';
        $q->options->incorrectfeedbackformat = FORMAT_HTML;

        $q->options->subquestions = array();
        $q->hints = array(
            new question_hint_with_parts(0, 'This is the first hint.', FORMAT_HTML, false, true),
            new question_hint_with_parts(0, 'This is the second hint.', FORMAT_HTML, true, false),
        );

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($q);

        $this->assertRegExp(
                '|<hint format=\"html\">\s*<text>\s*This is the first hint\.\s*</text>|', $xml);
        $this->assertRegExp(
                '|<hint format=\"html\">\s*<text>\s*This is the second hint\.\s*</text>|', $xml);
        list($ignored, $hint1, $hint2) = explode('<hint', $xml);
        $this->assertNotRegExp('|<shownumcorrect/>|', $hint1);
        $this->assertRegExp('|<clearwrong/>|', $hint1);
        $this->assertRegExp('|<shownumcorrect/>|', $hint2);
        $this->assertNotRegExp('|<clearwrong/>|', $hint2);
        $this->assertNotRegExp('|<options>|', $xml);
    }

    public function test_import_hints_no_parts() {
        $xml = <<<END
<question>
    <hint>
        <text>This is the first hint</text>
        <clearwrong/>
    </hint>
    <hint>
        <text>This is the second hint</text>
        <shownumcorrect/>
    </hint>
</question>
END;

        $questionxml = xmlize($xml);
        $qo = new stdClass();

        $importer = new qformat_xml();
        $importer->import_hints($qo, $questionxml['question'], false, false, 'html');

        $this->assertEquals(array(
                array('text' => 'This is the first hint',
                        'format' => FORMAT_HTML),
                array('text' => 'This is the second hint',
                        'format' => FORMAT_HTML),
                ), $qo->hint);
        $this->assertFalse(isset($qo->hintclearwrong));
        $this->assertFalse(isset($qo->hintshownumcorrect));
    }

    public function test_import_hints_with_parts() {
        $xml = <<<END
<question>
    <hint>
        <text>This is the first hint</text>
        <clearwrong/>
    </hint>
    <hint>
        <text>This is the second hint</text>
        <shownumcorrect/>
    </hint>
</question>
END;

        $questionxml = xmlize($xml);
        $qo = new stdClass();

        $importer = new qformat_xml();
        $importer->import_hints($qo, $questionxml['question'], true, true, 'html');

        $this->assertEquals(array(
                array('text' => 'This is the first hint',
                        'format' => FORMAT_HTML),
                array('text' => 'This is the second hint',
                        'format' => FORMAT_HTML),
                ), $qo->hint);
        $this->assertEquals(array(1, 0), $qo->hintclearwrong);
        $this->assertEquals(array(0, 1), $qo->hintshownumcorrect);
    }

    public function test_import_no_hints_no_error() {
        $xml = <<<END
<question>
</question>
END;

        $questionxml = xmlize($xml);
        $qo = new stdClass();

        $importer = new qformat_xml();
        $importer->import_hints($qo, $questionxml['question'], 'html');

        $this->assertFalse(isset($qo->hint));
    }

    public function test_import_description() {
        $xml = '  <question type="description">
    <name>
      <text>A description</text>
    </name>
    <questiontext format="html">
      <text>The question text.</text>
    </questiontext>
    <generalfeedback>
      <text>Here is some general feedback.</text>
    </generalfeedback>
    <defaultgrade>0</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <tags>
      <tag><text>tagDescription</text></tag>
      <tag><text>tagTest</text></tag>
    </tags>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_description($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'description';
        $expectedq->name = 'A description';
        $expectedq->questiontext = 'The question text.';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->generalfeedback = 'Here is some general feedback.';
        $expectedq->defaultmark = 0;
        $expectedq->length = 0;
        $expectedq->penalty = 0;
        $expectedq->tags = array('tagDescription', 'tagTest');

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_description() {
        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'description';
        $qdata->name = 'A description';
        $qdata->questiontext = 'The question text.';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'Here is some general feedback.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 0;
        $qdata->length = 0;
        $qdata->penalty = 0;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="description">
    <name>
      <text>A description</text>
    </name>
    <questiontext format="html">
      <text>The question text.</text>
    </questiontext>
    <generalfeedback format="html">
      <text>Here is some general feedback.</text>
    </generalfeedback>
    <defaultgrade>0</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_essay_20() {
        $xml = '  <question type="essay">
    <name>
      <text>An essay</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text>Write something.</text>
    </questiontext>
    <generalfeedback>
      <text>I hope you wrote something interesting.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <tags>
      <tag><text>tagEssay</text></tag>
      <tag><text>tagEssay20</text></tag>
      <tag><text>tagTest</text></tag>
    </tags>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_essay($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'essay';
        $expectedq->name = 'An essay';
        $expectedq->questiontext = 'Write something.';
        $expectedq->questiontextformat = FORMAT_MOODLE;
        $expectedq->generalfeedback = 'I hope you wrote something interesting.';
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 0;
        $expectedq->responseformat = 'editor';
        $expectedq->responserequired = 1;
        $expectedq->responsefieldlines = 15;
        $expectedq->attachments = 0;
        $expectedq->attachmentsrequired = 0;

>         $expectedq->maxbytes = 0;


        $expectedq->filetypeslist = null;
        $expectedq->graderinfo['text'] = '';
        $expectedq->graderinfo['format'] = FORMAT_MOODLE;
        $expectedq->responsetemplate['text'] = '';
        $expectedq->responsetemplate['format'] = FORMAT_MOODLE;
        $expectedq->tags = array('tagEssay', 'tagEssay20', 'tagTest');

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_import_essay_21() {
        $xml = '  <question type="essay">
    <name>
      <text>An essay</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text>Write something.</text>
    </questiontext>
    <generalfeedback>
      <text>I hope you wrote something interesting.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <responseformat>monospaced</responseformat>
    <responserequired>0</responserequired>
    <responsefieldlines>42</responsefieldlines>
    <attachments>-1</attachments>
    <attachmentsrequired>1</attachmentsrequired>
    <graderinfo format="html">
        <text><![CDATA[<p>Grade <b>generously</b>!</p>]]></text>
    </graderinfo>
    <responsetemplate format="html">
        <text><![CDATA[<p>Here is something <b>really</b> interesting.</p>]]></text>
    </responsetemplate>
    <tags>
      <tag><text>tagEssay</text></tag>
      <tag><text>tagEssay21</text></tag>
      <tag><text>tagTest</text></tag>
    </tags>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_essay($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'essay';
        $expectedq->name = 'An essay';
        $expectedq->questiontext = 'Write something.';
        $expectedq->questiontextformat = FORMAT_MOODLE;
        $expectedq->generalfeedback = 'I hope you wrote something interesting.';
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 0;
        $expectedq->responseformat = 'monospaced';
        $expectedq->responserequired = 0;
        $expectedq->responsefieldlines = 42;
        $expectedq->attachments = -1;
        $expectedq->attachmentsrequired = 1;

>         $expectedq->maxbytes = 0;


        $expectedq->filetypeslist = null;
        $expectedq->graderinfo['text'] = '<p>Grade <b>generously</b>!</p>';
        $expectedq->graderinfo['format'] = FORMAT_HTML;
        $expectedq->responsetemplate['text'] = '<p>Here is something <b>really</b> interesting.</p>';
        $expectedq->responsetemplate['format'] = FORMAT_HTML;
        $expectedq->tags = array('tagEssay', 'tagEssay21', 'tagTest');

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_essay() {
        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'essay';
        $qdata->name = 'An essay';
        $qdata->questiontext = 'Write something.';
        $qdata->questiontextformat = FORMAT_MOODLE;
        $qdata->generalfeedback = 'I hope you wrote something interesting.';
        $qdata->generalfeedbackformat = FORMAT_MOODLE;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 0;
        $qdata->hidden = 0;
        $qdata->idnumber = null;
        $qdata->options = new stdClass();
        $qdata->options->id = 456;
        $qdata->options->questionid = 123;
        $qdata->options->responseformat = 'monospaced';
        $qdata->options->responserequired = 0;
        $qdata->options->responsefieldlines = 42;
        $qdata->options->attachments = -1;
        $qdata->options->attachmentsrequired = 1;
        $qdata->options->graderinfo = '<p>Grade <b>generously</b>!</p>';
        $qdata->options->graderinfoformat = FORMAT_HTML;
        $qdata->options->responsetemplate = '<p>Here is something <b>really</b> interesting.</p>';
        $qdata->options->responsetemplateformat = FORMAT_HTML;

>         $qdata->options->maxbytes = 52428800; // 50MB.


        $qdata->options->filetypeslist = '.pdf,.zip.,.docx';
        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="essay">
    <name>
      <text>An essay</text>
    </name>
    <questiontext format="moodle_auto_format">
      <text>Write something.</text>
    </questiontext>
    <generalfeedback format="moodle_auto_format">
      <text>I hope you wrote something interesting.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <responseformat>monospaced</responseformat>
    <responserequired>0</responserequired>
    <responsefieldlines>42</responsefieldlines>
    <attachments>-1</attachments>
    <attachmentsrequired>1</attachmentsrequired>

>     <maxbytes>52428800</maxbytes>


    <filetypeslist>.pdf,.zip.,.docx</filetypeslist>
    <graderinfo format="html">
      <text><![CDATA[<p>Grade <b>generously</b>!</p>]]></text>
    </graderinfo>
    <responsetemplate format="html">
      <text><![CDATA[<p>Here is something <b>really</b> interesting.</p>]]></text>
    </responsetemplate>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_match_19() {
        $xml = '  <question type="matching">
    <name>
      <text>Matching question</text>
    </name>
    <questiontext format="html">
      <text>Match the upper and lower case letters.</text>
    </questiontext>
    <generalfeedback>
      <text>The answer is A -> a, B -> b and C -> c.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <shuffleanswers>false</shuffleanswers>
    <correctfeedback>
      <text>Well done.</text>
    </correctfeedback>
    <partiallycorrectfeedback>
      <text>Not entirely.</text>
    </partiallycorrectfeedback>
    <incorrectfeedback>
      <text>Completely wrong!</text>
    </incorrectfeedback>
    <subquestion>
      <text>A</text>
      <answer>
        <text>a</text>
      </answer>
    </subquestion>
    <subquestion>
      <text>B</text>
      <answer>
        <text>b</text>
      </answer>
    </subquestion>
    <subquestion>
      <text>C</text>
      <answer>
        <text>c</text>
      </answer>
    </subquestion>
    <subquestion>
      <text></text>
      <answer>
        <text>d</text>
      </answer>
    </subquestion>
    <hint>
      <text>Hint 1</text>
      <shownumcorrect />
    </hint>
    <hint>
      <text></text>
      <shownumcorrect />
      <clearwrong />
    </hint>
    <tags>
      <tag><text>tagMatching</text></tag>
      <tag><text>tagTest</text></tag>
    </tags>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_match($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'match';
        $expectedq->name = 'Matching question';
        $expectedq->questiontext = 'Match the upper and lower case letters.';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->correctfeedback = array('text' => 'Well done.',
                'format' => FORMAT_HTML);
        $expectedq->partiallycorrectfeedback = array('text' => 'Not entirely.',
                'format' => FORMAT_HTML);
        $expectedq->shownumcorrect = false;
        $expectedq->incorrectfeedback = array('text' => 'Completely wrong!',
                'format' => FORMAT_HTML);
        $expectedq->generalfeedback = 'The answer is A -> a, B -> b and C -> c.';
        $expectedq->generalfeedbackformat = FORMAT_HTML;
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 0.3333333;
        $expectedq->shuffleanswers = 0;
        $expectedq->subquestions = array(
            array('text' => 'A', 'format' => FORMAT_HTML),
            array('text' => 'B', 'format' => FORMAT_HTML),
            array('text' => 'C', 'format' => FORMAT_HTML),
            array('text' => '', 'format' => FORMAT_HTML));
        $expectedq->subanswers = array('a', 'b', 'c', 'd');
        $expectedq->hint = array(
            array('text' => 'Hint 1', 'format' => FORMAT_HTML),
            array('text' => '', 'format' => FORMAT_HTML),
        );
        $expectedq->hintshownumcorrect = array(true, true);
        $expectedq->hintclearwrong = array(false, true);
        $expectedq->tags = array('tagMatching', 'tagTest');

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_match() {
        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'match';
        $qdata->name = 'Matching question';
        $qdata->questiontext = 'Match the upper and lower case letters.';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'The answer is A -> a, B -> b and C -> c.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 0.3333333;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $qdata->options = new stdClass();
        $qdata->options->shuffleanswers = 1;
        $qdata->options->correctfeedback = 'Well done.';
        $qdata->options->correctfeedbackformat = FORMAT_HTML;
        $qdata->options->partiallycorrectfeedback = 'Not entirely.';
        $qdata->options->partiallycorrectfeedbackformat = FORMAT_HTML;
        $qdata->options->shownumcorrect = false;
        $qdata->options->incorrectfeedback = 'Completely wrong!';
        $qdata->options->incorrectfeedbackformat = FORMAT_HTML;

        $subq1 = new stdClass();
        $subq1->id = -4;
        $subq1->questiontext = 'A';
        $subq1->questiontextformat = FORMAT_HTML;
        $subq1->answertext = 'a';

        $subq2 = new stdClass();
        $subq2->id = -3;
        $subq2->questiontext = 'B';
        $subq2->questiontextformat = FORMAT_HTML;
        $subq2->answertext = 'b';

        $subq3 = new stdClass();
        $subq3->id = -2;
        $subq3->questiontext = 'C';
        $subq3->questiontextformat = FORMAT_HTML;
        $subq3->answertext = 'c';

        $subq4 = new stdClass();
        $subq4->id = -1;
        $subq4->questiontext = '';
        $subq4->questiontextformat = FORMAT_HTML;
        $subq4->answertext = 'd';

        $qdata->options->subquestions = array(
                $subq1, $subq2, $subq3, $subq4);

        $qdata->hints = array(
            new question_hint_with_parts(0, 'Hint 1', FORMAT_HTML, true, false),
            new question_hint_with_parts(0, '', FORMAT_HTML, true, true),
        );

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="matching">
    <name>
      <text>Matching question</text>
    </name>
    <questiontext format="html">
      <text>Match the upper and lower case letters.</text>
    </questiontext>
    <generalfeedback format="html">
      <text><![CDATA[The answer is A -> a, B -> b and C -> c.]]></text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <shuffleanswers>true</shuffleanswers>
    <correctfeedback format="html">
      <text>Well done.</text>
    </correctfeedback>
    <partiallycorrectfeedback format="html">
      <text>Not entirely.</text>
    </partiallycorrectfeedback>
    <incorrectfeedback format="html">
      <text>Completely wrong!</text>
    </incorrectfeedback>
    <subquestion format="html">
      <text>A</text>
      <answer>
        <text>a</text>
      </answer>
    </subquestion>
    <subquestion format="html">
      <text>B</text>
      <answer>
        <text>b</text>
      </answer>
    </subquestion>
    <subquestion format="html">
      <text>C</text>
      <answer>
        <text>c</text>
      </answer>
    </subquestion>
    <subquestion format="html">
      <text></text>
      <answer>
        <text>d</text>
      </answer>
    </subquestion>
    <hint format="html">
      <text>Hint 1</text>
      <shownumcorrect/>
    </hint>
    <hint format="html">
      <text></text>
      <shownumcorrect/>
      <clearwrong/>
    </hint>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_multichoice_19() {
        $xml = '  <question type="multichoice">
    <name>
      <text>Multiple choice question</text>
    </name>
    <questiontext format="html">
      <text>Which are the even numbers?</text>
    </questiontext>
    <generalfeedback>
      <text>The even numbers are 2 and 4.</text>
    </generalfeedback>
    <defaultgrade>2</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <single>false</single>
    <shuffleanswers>false</shuffleanswers>
    <answernumbering>abc</answernumbering>
    <correctfeedback>
      <text><![CDATA[<p>Your answer is correct.</p>]]></text>
    </correctfeedback>
    <partiallycorrectfeedback>
      <text><![CDATA[<p>Your answer is partially correct.</p>]]></text>
    </partiallycorrectfeedback>
    <incorrectfeedback>
      <text><![CDATA[<p>Your answer is incorrect.</p>]]></text>
    </incorrectfeedback>
    <shownumcorrect/>
    <answer fraction="0">
      <text>1</text>
      <feedback>
        <text></text>
      </feedback>
    </answer>
    <answer fraction="100">
      <text>2</text>
      <feedback>
        <text></text>
      </feedback>
    </answer>
    <answer fraction="0">
      <text>3</text>
      <feedback>
        <text></text>
      </feedback>
    </answer>
    <answer fraction="100">
      <text>4</text>
      <feedback>
        <text></text>
      </feedback>
    </answer>
    <hint>
      <text>Hint 1.</text>
    </hint>
    <hint>
      <text>Hint 2.</text>
    </hint>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_multichoice($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'multichoice';
        $expectedq->name = 'Multiple choice question';
        $expectedq->questiontext = 'Which are the even numbers?';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->correctfeedback = array(
                'text'   => '<p>Your answer is correct.</p>',
                'format' => FORMAT_HTML);
        $expectedq->shownumcorrect = false;
        $expectedq->partiallycorrectfeedback = array(
                'text'   => '<p>Your answer is partially correct.</p>',
                'format' => FORMAT_HTML);
        $expectedq->shownumcorrect = true;
        $expectedq->incorrectfeedback = array(
                'text'   => '<p>Your answer is incorrect.</p>',
                'format' => FORMAT_HTML);
        $expectedq->generalfeedback = 'The even numbers are 2 and 4.';
        $expectedq->defaultmark = 2;
        $expectedq->length = 1;
        $expectedq->penalty = 0.3333333;
        $expectedq->shuffleanswers = 0;
        $expectedq->single = false;

        $expectedq->answer = array(
            array('text' => '1', 'format' => FORMAT_HTML),
            array('text' => '2', 'format' => FORMAT_HTML),
            array('text' => '3', 'format' => FORMAT_HTML),
            array('text' => '4', 'format' => FORMAT_HTML));
        $expectedq->fraction = array(0, 1, 0, 1);
        $expectedq->feedback = array(
            array('text' => '', 'format' => FORMAT_HTML),
            array('text' => '', 'format' => FORMAT_HTML),
            array('text' => '', 'format' => FORMAT_HTML),
            array('text' => '', 'format' => FORMAT_HTML));

        $expectedq->hint = array(
            array('text' => 'Hint 1.', 'format' => FORMAT_HTML),
            array('text' => 'Hint 2.', 'format' => FORMAT_HTML),
        );
        $expectedq->hintshownumcorrect = array(false, false);
        $expectedq->hintclearwrong = array(false, false);

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_multichoice() {
        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'multichoice';
        $qdata->name = 'Multiple choice question';
        $qdata->questiontext = 'Which are the even numbers?';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'The even numbers are 2 and 4.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 2;
        $qdata->length = 1;
        $qdata->penalty = 0.3333333;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $qdata->options = new stdClass();
        $qdata->options->single = 0;
        $qdata->options->shuffleanswers = 0;
        $qdata->options->answernumbering = 'abc';
        $qdata->options->showstandardinstruction = 0;
        $qdata->options->correctfeedback = '<p>Your answer is correct.</p>';
        $qdata->options->correctfeedbackformat = FORMAT_HTML;
        $qdata->options->partiallycorrectfeedback = '<p>Your answer is partially correct.</p>';
        $qdata->options->partiallycorrectfeedbackformat = FORMAT_HTML;
        $qdata->options->shownumcorrect = 1;
        $qdata->options->incorrectfeedback = '<p>Your answer is incorrect.</p>';
        $qdata->options->incorrectfeedbackformat = FORMAT_HTML;

        $qdata->options->answers = array(
            13 => new question_answer(13, '1', 0, '', FORMAT_HTML),
            14 => new question_answer(14, '2', 1, '', FORMAT_HTML),
            15 => new question_answer(15, '3', 0, '', FORMAT_HTML),
            16 => new question_answer(16, '4', 1, '', FORMAT_HTML),
        );

        $qdata->hints = array(
            new question_hint_with_parts(0, 'Hint 1.', FORMAT_HTML, false, false),
            new question_hint_with_parts(0, 'Hint 2.', FORMAT_HTML, false, false),
        );

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="multichoice">
    <name>
      <text>Multiple choice question</text>
    </name>
    <questiontext format="html">
      <text>Which are the even numbers?</text>
    </questiontext>
    <generalfeedback format="html">
      <text>The even numbers are 2 and 4.</text>
    </generalfeedback>
    <defaultgrade>2</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <single>false</single>
    <shuffleanswers>false</shuffleanswers>
    <answernumbering>abc</answernumbering>
    <showstandardinstruction>0</showstandardinstruction>
    <correctfeedback format="html">
      <text><![CDATA[<p>Your answer is correct.</p>]]></text>
    </correctfeedback>
    <partiallycorrectfeedback format="html">
      <text><![CDATA[<p>Your answer is partially correct.</p>]]></text>
    </partiallycorrectfeedback>
    <incorrectfeedback format="html">
      <text><![CDATA[<p>Your answer is incorrect.</p>]]></text>
    </incorrectfeedback>
    <shownumcorrect/>
    <answer fraction="0" format="plain_text">
      <text>1</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
    <answer fraction="100" format="plain_text">
      <text>2</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>3</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
    <answer fraction="100" format="plain_text">
      <text>4</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
    <hint format="html">
      <text>Hint 1.</text>
    </hint>
    <hint format="html">
      <text>Hint 2.</text>
    </hint>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_numerical_19() {
        $xml = '  <question type="numerical">
    <name>
      <text>Numerical question</text>
    </name>
    <questiontext format="html">
      <text>What is the answer?</text>
    </questiontext>
    <generalfeedback>
      <text>General feedback: Think Hitch-hikers guide to the Galaxy.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.1</penalty>
    <hidden>0</hidden>
    <answer fraction="100">
      <text>42</text>
      <feedback>
        <text>Well done!</text>
      </feedback>
      <tolerance>0.001</tolerance>
    </answer>
    <answer fraction="0">
      <text>13</text>
      <feedback>
        <text>What were you thinking?!</text>
      </feedback>
      <tolerance>1</tolerance>
    </answer>
    <answer fraction="0">
      <text>*</text>
      <feedback>
        <text>Completely wrong.</text>
      </feedback>
      <tolerance></tolerance>
    </answer>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_numerical($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'numerical';
        $expectedq->name = 'Numerical question';
        $expectedq->questiontext = 'What is the answer?';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->generalfeedback = 'General feedback: Think Hitch-hikers guide to the Galaxy.';
        $expectedq->generalfeedbackformat = FORMAT_HTML;
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 0.1;

        $expectedq->answer = array('42', '13', '*');
        $expectedq->fraction = array(1, 0, 0);
        $expectedq->feedback = array(
            array('text' => 'Well done!',
                    'format' => FORMAT_HTML),
            array('text' => 'What were you thinking?!',
                    'format' => FORMAT_HTML),
            array('text' => 'Completely wrong.',
                    'format' => FORMAT_HTML));
        $expectedq->tolerance = array(0.001, 1, 0);

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_numerical() {
        question_bank::load_question_definition_classes('numerical');

        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'numerical';
        $qdata->name = 'Numerical question';
        $qdata->questiontext = 'What is the answer?';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'General feedback: Think Hitch-hikers guide to the Galaxy.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 0.1;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $qdata->options = new stdClass();
        $qdata->options->answers = array(
            13 => new qtype_numerical_answer(13, '42', 1, 'Well done!',
                    FORMAT_HTML, 0.001),
            14 => new qtype_numerical_answer(14, '13', 0, 'What were you thinking?!',
                    FORMAT_HTML, 1),
            15 => new qtype_numerical_answer(15, '*', 0, 'Completely wrong.',
                    FORMAT_HTML, ''),
        );

        $qdata->options->units = array();

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="numerical">
    <name>
      <text>Numerical question</text>
    </name>
    <questiontext format="html">
      <text>What is the answer?</text>
    </questiontext>
    <generalfeedback format="html">
      <text>General feedback: Think Hitch-hikers guide to the Galaxy.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.1</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <answer fraction="100" format="plain_text">
      <text>42</text>
      <feedback format="html">
        <text>Well done!</text>
      </feedback>
      <tolerance>0.001</tolerance>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>13</text>
      <feedback format="html">
        <text>What were you thinking?!</text>
      </feedback>
      <tolerance>1</tolerance>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>*</text>
      <feedback format="html">
        <text>Completely wrong.</text>
      </feedback>
      <tolerance>0</tolerance>
    </answer>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_shortanswer_19() {
        $xml = '  <question type="shortanswer">
    <name>
      <text>Short answer question</text>
    </name>
    <questiontext format="html">
      <text>Fill in the gap in this sequence: Alpha, ________, Gamma.</text>
    </questiontext>
    <generalfeedback>
      <text>The answer is Beta.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <usecase>0</usecase>
    <answer fraction="100" format="plain_text">
      <text>Beta</text>
      <feedback>
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>*</text>
      <feedback>
        <text>Doh!</text>
      </feedback>
    </answer>
    <hint>
      <text>Hint 1</text>
    </hint>
    <hint>
      <text>Hint 2</text>
    </hint>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_shortanswer($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'shortanswer';
        $expectedq->name = 'Short answer question';
        $expectedq->questiontext = 'Fill in the gap in this sequence: Alpha, ________, Gamma.';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->generalfeedback = 'The answer is Beta.';
        $expectedq->usecase = false;
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 0.3333333;

        $expectedq->answer = array('Beta', '*');
        $expectedq->fraction = array(1, 0);
        $expectedq->feedback = array(
            array('text' => 'Well done!', 'format' => FORMAT_HTML),
            array('text' => 'Doh!', 'format' => FORMAT_HTML));

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_shortanswer() {
        $qdata = new stdClass();
        $qdata->id = 123;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'shortanswer';
        $qdata->name = 'Short answer question';
        $qdata->questiontext = 'Fill in the gap in this sequence: Alpha, ________, Gamma.';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'The answer is Beta.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 0.3333333;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $qdata->options = new stdClass();
        $qdata->options->usecase = 0;

        $qdata->options->answers = array(
            13 => new question_answer(13, 'Beta', 1, 'Well done!', FORMAT_HTML),
            14 => new question_answer(14, '*', 0, 'Doh!', FORMAT_HTML),
        );

        $qdata->hints = array(
            new question_hint(0, 'Hint 1', FORMAT_HTML),
            new question_hint(0, 'Hint 2', FORMAT_HTML),
        );

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 123  -->
  <question type="shortanswer">
    <name>
      <text>Short answer question</text>
    </name>
    <questiontext format="html">
      <text>Fill in the gap in this sequence: Alpha, ________, Gamma.</text>
    </questiontext>
    <generalfeedback format="html">
      <text>The answer is Beta.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <usecase>0</usecase>
    <answer fraction="100" format="plain_text">
      <text>Beta</text>
      <feedback format="html">
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>*</text>
      <feedback format="html">
        <text>Doh!</text>
      </feedback>
    </answer>
    <hint format="html">
      <text>Hint 1</text>
    </hint>
    <hint format="html">
      <text>Hint 2</text>
    </hint>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_truefalse_19() {
        $xml = '  <question type="truefalse">
    <name>
      <text>True false question</text>
    </name>
    <questiontext format="html">
      <text>The answer is true.</text>
    </questiontext>
    <generalfeedback>
      <text>General feedback: You should have chosen true.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>1</penalty>
    <hidden>0</hidden>
    <answer fraction="100">
      <text>true</text>
      <feedback>
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0">
      <text>false</text>
      <feedback>
        <text>Doh!</text>
      </feedback>
    </answer>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_truefalse($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'truefalse';
        $expectedq->name = 'True false question';
        $expectedq->questiontext = 'The answer is true.';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->generalfeedback = 'General feedback: You should have chosen true.';
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 1;

        $expectedq->feedbacktrue = array('text' => 'Well done!',
                'format' => FORMAT_HTML);
        $expectedq->feedbackfalse = array('text' => 'Doh!',
                'format' => FORMAT_HTML);
        $expectedq->correctanswer = true;

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_import_truefalse_with_idnumber() {
        $xml = '  <question type="truefalse">
    <name>
      <text>True false question</text>
    </name>
    <questiontext format="html">
      <text>The answer is true.</text>
    </questiontext>
    <generalfeedback>
      <text>General feedback: You should have chosen true.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>1</penalty>
    <hidden>0</hidden>
    <idnumber>TestIdNum1</idnumber>
    <answer fraction="100">
      <text>true</text>
      <feedback>
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0">
      <text>false</text>
      <feedback>
        <text>Doh!</text>
      </feedback>
    </answer>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_truefalse($xmldata['question']);

        $expectedq = new stdClass();
        $expectedq->qtype = 'truefalse';
        $expectedq->name = 'True false question';
        $expectedq->questiontext = 'The answer is true.';
        $expectedq->questiontextformat = FORMAT_HTML;
        $expectedq->generalfeedback = 'General feedback: You should have chosen true.';
        $expectedq->defaultmark = 1;
        $expectedq->length = 1;
        $expectedq->penalty = 1;
        $expectedq->idnumber = 'TestIdNum1';

        $expectedq->feedbacktrue = array('text' => 'Well done!',
                'format' => FORMAT_HTML);
        $expectedq->feedbackfalse = array('text' => 'Doh!',
                'format' => FORMAT_HTML);
        $expectedq->correctanswer = true;

        $this->assert(new question_check_specified_fields_expectation($expectedq), $q);
    }

    public function test_export_truefalse() {
        $qdata = new stdClass();
        $qdata->id = 12;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'truefalse';
        $qdata->name = 'True false question';
        $qdata->questiontext = 'The answer is true.';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'General feedback: You should have chosen true.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 1;
        $qdata->hidden = 0;
        $qdata->idnumber = null;

        $qdata->options = new stdClass();
        $qdata->options->answers = array(
            1 => new question_answer(1, 'True', 1, 'Well done!', FORMAT_HTML),
            2 => new question_answer(2, 'False', 0, 'Doh!', FORMAT_HTML),
        );
        $qdata->options->trueanswer = 1;
        $qdata->options->falseanswer = 2;

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 12  -->
  <question type="truefalse">
    <name>
      <text>True false question</text>
    </name>
    <questiontext format="html">
      <text>The answer is true.</text>
    </questiontext>
    <generalfeedback format="html">
      <text>General feedback: You should have chosen true.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>1</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <answer fraction="100" format="plain_text">
      <text>true</text>
      <feedback format="html">
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>false</text>
      <feedback format="html">
        <text>Doh!</text>
      </feedback>
    </answer>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_export_truefalse_with_idnumber() {
        $qdata = new stdClass();
        $qdata->id = 12;
        $qdata->contextid = \context_system::instance()->id;
        $qdata->qtype = 'truefalse';
        $qdata->name = 'True false question';
        $qdata->questiontext = 'The answer is true.';
        $qdata->questiontextformat = FORMAT_HTML;
        $qdata->generalfeedback = 'General feedback: You should have chosen true.';
        $qdata->generalfeedbackformat = FORMAT_HTML;
        $qdata->defaultmark = 1;
        $qdata->length = 1;
        $qdata->penalty = 1;
        $qdata->hidden = 0;
        $qdata->idnumber = 'TestIDNum2';

        $qdata->options = new stdClass();
        $qdata->options->answers = array(
                1 => new question_answer(1, 'True', 1, 'Well done!', FORMAT_HTML),
                2 => new question_answer(2, 'False', 0, 'Doh!', FORMAT_HTML),
        );
        $qdata->options->trueanswer = 1;
        $qdata->options->falseanswer = 2;

        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 12  -->
  <question type="truefalse">
    <name>
      <text>True false question</text>
    </name>
    <questiontext format="html">
      <text>The answer is true.</text>
    </questiontext>
    <generalfeedback format="html">
      <text>General feedback: You should have chosen true.</text>
    </generalfeedback>
    <defaultgrade>1</defaultgrade>
    <penalty>1</penalty>
    <hidden>0</hidden>
    <idnumber>TestIDNum2</idnumber>
    <answer fraction="100" format="plain_text">
      <text>true</text>
      <feedback format="html">
        <text>Well done!</text>
      </feedback>
    </answer>
    <answer fraction="0" format="plain_text">
      <text>false</text>
      <feedback format="html">
        <text>Doh!</text>
      </feedback>
    </answer>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_multianswer() {
        $xml = '  <question type="cloze">
    <name>
      <text>Simple multianswer</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[Complete this opening line of verse: "The {1:SHORTANSWER:Dog#Wrong, silly!~=Owl#Well done!~*#Wrong answer} and the {1:MULTICHOICE:Bow-wow#You seem to have a dog obsessions!~Wiggly worm#Now you are just being ridiculous!~=Pussy-cat#Well done!} went to sea".]]></text>
    </questiontext>
    <generalfeedback format="html">
      <text><![CDATA[General feedback: It\'s from "The Owl and the Pussy-cat" by Lear: "The owl and the pussycat went to sea".]]></text>
    </generalfeedback>
    <penalty>0.5</penalty>
    <hidden>0</hidden>
    <hint format="html">
      <text>Hint 1</text>
    </hint>
    <hint format="html">
      <text>Hint 2</text>
    </hint>
    <tags>
      <tag><text>tagCloze</text></tag>
      <tag><text>tagTest</text></tag>
    </tags>
  </question>
';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_multianswer($xmldata['question']);

        // Annoyingly, import works in a weird way (it duplicates code, rather
        // than just calling save_question) so we cannot use
        // test_question_maker::get_question_form_data('multianswer', 'twosubq').
        $expectedqa = new stdClass();
        $expectedqa->name = 'Simple multianswer';
        $expectedqa->qtype = 'multianswer';
        $expectedqa->questiontext = 'Complete this opening line of verse: "The {#1} and the {#2} went to sea".';
        $expectedqa->generalfeedback =
                'General feedback: It\'s from "The Owl and the Pussy-cat" by Lear: "The owl and the pussycat went to sea".';
        $expectedqa->defaultmark = 2;
        $expectedqa->penalty = 0.5;

        $expectedqa->hint = array(
            array('text' => 'Hint 1', 'format' => FORMAT_HTML),
            array('text' => 'Hint 2', 'format' => FORMAT_HTML),
        );

        $sa = new stdClass();

        $sa->questiontext = array('text' => '{1:SHORTANSWER:Dog#Wrong, silly!~=Owl#Well done!~*#Wrong answer}',
                'format' => FORMAT_HTML, 'itemid' => null);
        $sa->generalfeedback = array('text' => '', 'format' => FORMAT_HTML, 'itemid' => null);
        $sa->defaultmark = 1.0;
        $sa->qtype = 'shortanswer';
        $sa->usecase = 0;

        $sa->answer = array('Dog', 'Owl', '*');
        $sa->fraction = array(0, 1, 0);
        $sa->feedback = array(
            array('text' => 'Wrong, silly!', 'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Well done!',    'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Wrong answer',  'format' => FORMAT_HTML, 'itemid' => null),
        );

        $mc = new stdClass();

        $mc->generalfeedback = '';
        $mc->questiontext = array('text' => '{1:MULTICHOICE:Bow-wow#You seem to have a dog obsessions!~' .
                'Wiggly worm#Now you are just being ridiculous!~=Pussy-cat#Well done!}',
                'format' => FORMAT_HTML, 'itemid' => null);
        $mc->generalfeedback = array('text' => '', 'format' => FORMAT_HTML, 'itemid' => null);
        $mc->defaultmark = 1.0;
        $mc->qtype = 'multichoice';

        $mc->layout = 0;
        $mc->single = 1;
        $mc->shuffleanswers = 0;
        $mc->correctfeedback =          array('text' => '', 'format' => FORMAT_HTML, 'itemid' => null);
        $mc->partiallycorrectfeedback = array('text' => '', 'format' => FORMAT_HTML, 'itemid' => null);
        $mc->incorrectfeedback =        array('text' => '', 'format' => FORMAT_HTML, 'itemid' => null);
        $mc->answernumbering = 0;

        $mc->answer = array(
            array('text' => 'Bow-wow',     'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Wiggly worm', 'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Pussy-cat',   'format' => FORMAT_HTML, 'itemid' => null),
        );
        $mc->fraction = array(0, 0, 1);
        $mc->feedback = array(
            array('text' => 'You seem to have a dog obsessions!', 'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Now you are just being ridiculous!', 'format' => FORMAT_HTML, 'itemid' => null),
            array('text' => 'Well done!',                         'format' => FORMAT_HTML, 'itemid' => null),
        );

        $expectedqa->options = new stdClass();
        $expectedqa->options->questions = array(
            1 => $sa,
            2 => $mc,
        );
        $expectedqa->tags = array('tagCloze', 'tagTest');

        $this->assertEquals($expectedqa->hint, $q->hint);
        $this->assertEquals($expectedqa->options->questions[1], $q->options->questions[1]);
        $this->assertEquals($expectedqa->options->questions[2], $q->options->questions[2]);
        $this->assert(new question_check_specified_fields_expectation($expectedqa), $q);
    }

    public function test_export_multianswer() {
        $qdata = test_question_maker::get_question_data('multianswer', 'twosubq');
        $qdata->contextid = \context_system::instance()->id;
        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 0  -->
  <question type="cloze">
    <name>
      <text>Simple multianswer</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[Complete this opening line of verse: "The {1:SHORTANSWER:Dog#Wrong, silly!~=Owl#Well done!~*#Wrong answer} and the {1:MULTICHOICE:Bow-wow#You seem to have a dog obsessions!~Wiggly worm#Now you are just being ridiculous!~=Pussy-cat#Well done!} went to sea".]]></text>
    </questiontext>
    <generalfeedback format="html">
      <text><![CDATA[General feedback: It\'s from "The Owl and the Pussy-cat" by Lear: "The owl and the pussycat went to sea]]></text>
    </generalfeedback>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
    <hint format="html">
      <text>Hint 1</text>
    </hint>
    <hint format="html">
      <text>Hint 2</text>
    </hint>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_export_multianswer_withdollars() {
        $qdata = test_question_maker::get_question_data('multianswer', 'dollarsigns');
        $qdata->contextid = \context_system::instance()->id;
        $exporter = new qformat_xml();
        $xml = $exporter->writequestion($qdata);

        $expectedxml = '<!-- question: 0  -->
  <question type="cloze">
    <name>
      <text>Multianswer with $s</text>
    </name>
    <questiontext format="html">
      <text>Which is the right order? {1:MULTICHOICE:=y,y,$3~$3,y,y}</text>
    </questiontext>
    <generalfeedback format="html">
      <text></text>
    </generalfeedback>
    <penalty>0.3333333</penalty>
    <hidden>0</hidden>
    <idnumber></idnumber>
  </question>
';

        $this->assert_same_xml($expectedxml, $xml);
    }

    public function test_import_files_as_draft() {
        $this->resetAfterTest();
        $this->setAdminUser();

        $xml = <<<END
<questiontext format="html">
    <text><![CDATA[<p><a href="@@PLUGINFILE@@/moodle.txt">This text file</a> contains the word 'Moodle'.</p>]]></text>
    <file name="moodle.txt" encoding="base64">TW9vZGxl</file>
</questiontext>
END;

        $textxml = xmlize($xml);
        $qo = new stdClass();

        $importer = new qformat_xml();
        $draftitemid = $importer->import_files_as_draft($textxml['questiontext']['#']['file']);
        $files = file_get_drafarea_files($draftitemid);

        $this->assertEquals(1, count($files->list));

        $file = $files->list[0];
        $this->assertEquals('moodle.txt', $file->filename);
        $this->assertEquals('/',          $file->filepath);
        $this->assertEquals(6,            $file->size);
    }

    public function test_import_truefalse_wih_files() {
        $this->resetAfterTest();
        $this->setAdminUser();

        $xml = '<question type="truefalse">
    <name>
      <text>truefalse</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[<p><a href="@@PLUGINFILE@@/myfolder/moodle.txt">This text file</a> contains the word Moodle.</p>]]></text>
<file name="moodle.txt" path="/myfolder/" encoding="base64">TW9vZGxl</file>
    </questiontext>
    <generalfeedback format="html">
      <text><![CDATA[<p>For further information, see the documentation about Moodle.</p>]]></text>
</generalfeedback>
    <defaultgrade>1.0000000</defaultgrade>
    <penalty>1.0000000</penalty>
    <hidden>0</hidden>
    <answer fraction="100" format="moodle_auto_format">
      <text>true</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
    <answer fraction="0" format="moodle_auto_format">
      <text>false</text>
      <feedback format="html">
        <text></text>
      </feedback>
    </answer>
  </question>';
        $xmldata = xmlize($xml);

        $importer = new qformat_xml();
        $q = $importer->import_truefalse($xmldata['question']);

        $draftitemid = $q->questiontextitemid;
        $files = file_get_drafarea_files($draftitemid, '/myfolder/');

        $this->assertEquals(1, count($files->list));

        $file = $files->list[0];
        $this->assertEquals('moodle.txt', $file->filename);
        $this->assertEquals('/myfolder/', $file->filepath);
        $this->assertEquals(6,            $file->size);
    }

    public function test_create_dummy_question() {

        $testobject = new mock_qformat_xml();
        $categoryname = 'name1';
        $categoryinfo = new stdClass();
        $categoryinfo->info = 'info1';
        $categoryinfo->infoformat = 'infoformat1';
        $categoryinfo->idnumber = null;
        $dummyquestion = $testobject->mock_create_dummy_question_representing_category($categoryname, $categoryinfo);

        $this->assertEquals('category', $dummyquestion->qtype);
        $this->assertEquals($categoryname, $dummyquestion->category);
        $this->assertEquals($categoryinfo->info, $dummyquestion->info);
        $this->assertEquals($categoryinfo->infoformat, $dummyquestion->infoformat);
        $this->assertEquals('Switch category to ' . $categoryname, $dummyquestion->name);
        $this->assertEquals(0, $dummyquestion->id);
        $this->assertEquals('', $dummyquestion->questiontextformat);
        $this->assertEquals(0, $dummyquestion->contextid);
    }
}

/**
 * Class mock_qformat_xml exists only to enable testing of the create dummy question category.
 * @package    qformat_xml
 * @copyright  2018 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class mock_qformat_xml extends qformat_xml {
    /**
     * Make public an otherwise protected function.
     * @param string $categoryname the name of the category
     * @param object $categoryinfo description of the category
     */
    public function mock_create_dummy_question_representing_category(string $categoryname, $categoryinfo) {
        return $this->create_dummy_question_representing_category($categoryname, $categoryinfo);
    }
}