MDL-66801 questions: XML import/export should include category idnumbers

question/format/xml/format.php

@@ -935,6 +935,7 @@ class qformat_xml extends qformat_default {
             // The import should have the format in human readable form, so translate to machine readable format.
             $qo->infoformat = $this->trans_format($question['#']['info'][0]['@']['format']);
         }
+        $qo->idnumber = $this->getpath($question, array('#', 'idnumber', 0, '#'), null);
         return $qo;
     }
 
@@ -1205,6 +1206,7 @@ class qformat_xml extends qformat_default {
             $expout .= "    <info {$infoformat}>\n";
             $expout .= "      {$categoryinfo}";
             $expout .= "    </info>\n";
+            $expout .= "    <idnumber>{$question->idnumber}</idnumber>\n";
             $expout .= "  </question>\n";
             return $expout;
         }

question/format/xml/tests/fixtures/category_with_description.xml

@@ -8,6 +8,7 @@
     <info format="moodle_auto_format">
         <text>This is Alpha category for test</text>
     </info>
+    <idnumber>alpha-idnumber</idnumber>
   </question>
 
 <!-- question: 91  -->

question/format/xml/tests/fixtures/export_category.xml

@@ -8,6 +8,7 @@
     <info format="moodle_auto_format">
       <text>This is Alpha category for test</text>
     </info>
+    <idnumber>alpha-idnumber</idnumber>
   </question>
 
 <!-- question: 91  -->

question/format/xml/tests/fixtures/nested_categories.xml

@@ -8,6 +8,7 @@
     <info format="plain_text">
       <text>This is Delta category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 0  -->
@@ -18,6 +19,7 @@
     <info format="markdown">
       <text>This is Epsilon category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 0  -->
@@ -28,6 +30,7 @@
     <info format="moodle_auto_format">
       <text>This is Zeta category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 93  -->

question/format/xml/tests/fixtures/nested_categories_with_questions.xml

@@ -8,6 +8,7 @@
     <info format="plain_text">
       <text>This is Iota category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 96  -->
@@ -47,6 +48,7 @@
     <info format="markdown">
       <text>This is Kappa category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 106  -->
@@ -114,6 +116,7 @@
     <info format="moodle_auto_format">
       <text>This is Lambda category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 98  -->
@@ -153,6 +156,7 @@
     <info format="moodle_auto_format">
       <text>This is Mu category for test</text>
     </info>
+    <idnumber></idnumber>
   </question>
 
 <!-- question: 99  -->

question/format/xml/tests/qformat_xml_import_export_test.php

@@ -38,8 +38,8 @@ class qformat_xml_import_export_test extends advanced_testcase {
     /**
      * Create object qformat_xml for test.
      * @param string $filename with name for testing file.
-     * @param object $course
-     * @return object qformat_xml.
+     * @param stdClass $course
+     * @return qformat_xml XML question format object.
      */
     public function create_qformat($filename, $course) {
         global $DB;
@@ -99,11 +99,12 @@ class qformat_xml_import_export_test extends advanced_testcase {
      * @param string $info imported category info field (description of category).
      * @param int $infoformat imported category info field format.
      */
-    public function assert_category_imported($name, $info, $infoformat) {
+    public function assert_category_imported($name, $info, $infoformat, $idnumber = null) {
         global $DB;
         $category = $DB->get_record('question_categories', ['name' => $name], '*', MUST_EXIST);
         $this->assertEquals($info, $category->info);
         $this->assertEquals($infoformat, $category->infoformat);
+        $this->assertSame($idnumber, $category->idnumber);
     }
 
     /**
@@ -146,7 +147,8 @@ class qformat_xml_import_export_test extends advanced_testcase {
         $qformat = $this->create_qformat('category_with_description.xml', $course);
         $imported = $qformat->importprocess();
         $this->assertTrue($imported);
-        $this->assert_category_imported('Alpha', 'This is Alpha category for test', FORMAT_MOODLE);
+        $this->assert_category_imported('Alpha',
+                'This is Alpha category for test', FORMAT_MOODLE, 'alpha-idnumber');
         $this->assert_category_has_parent('Alpha', 'top');
     }
 
@@ -246,6 +248,7 @@ class qformat_xml_import_export_test extends advanced_testcase {
                 'contextid' => '2',
                 'info' => 'This is Alpha category for test',
                 'infoformat' => '0',
+                'idnumber' => 'alpha-idnumber',
                 'stamp' => make_unique_id_code(),
                 'parent' => '0',
                 'sortorder' => '999']);

question/format/xml/tests/xmlformat_test.php

@@ -1721,6 +1721,7 @@ END;
         $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);