diff --git a/edit_drawlines_form.php b/edit_drawlines_form.php
index db6ae7b..5d800cd 100644
--- a/edit_drawlines_form.php
+++ b/edit_drawlines_form.php
@@ -315,5 +315,4 @@ protected function get_per_line_fields(MoodleQuickForm $mform, string $label, ar
         $mform->setType('zoneend', PARAM_RAW_TRIMMED);
         return $repeated;
     }
-    
 }
diff --git a/lang/en/qtype_drawlines.php b/lang/en/qtype_drawlines.php
index 7a31398..7abe145 100644
--- a/lang/en/qtype_drawlines.php
+++ b/lang/en/qtype_drawlines.php
@@ -75,5 +75,5 @@
 $string['type_help'] = 'You can choose whether the line doesn’t have a beginning or end (line), has one or more ends (right, left, and double arrows), or it only matters that the line intersects specific points on the graph (intersect points).';
 
 $string['zonecoordinates'] = 'x,y;r (where x,y are the coordinates of the centre of the circle and r is the radius)';
-$string['zonestart'] = 'Start zone coordinates'; // Coordinatare are in 'xcenter,ycenter;radius'.
-$string['zoneend'] = 'End zone coordinates'; // Coordinatare are in 'xcenter,ycenter;radius'.
+$string['zonestart'] = 'Start zone coordinates';
+$string['zoneend'] = 'End zone coordinates';
diff --git a/questiontype.php b/questiontype.php
index 85834f0..c6d5ece 100644
--- a/questiontype.php
+++ b/questiontype.php
@@ -232,16 +232,9 @@ protected function delete_files($questionid, $contextid) {
         parent::delete_files($questionid, $contextid);
         $this->delete_files_in_combined_feedback($questionid, $contextid);
         $this->delete_files_in_hints($questionid, $contextid);
-
-
-            $fs = get_file_storage();
-
-            parent::delete_files($questionid, $contextid);
-            $this->delete_files_in_row_feedback($questionid, $contextid);
-            $this->delete_files_in_hints($questionid, $contextid);
-            $fs->delete_area_files($contextid, 'question', 'correctfeedback', $questionid);
-            $fs->delete_area_files($contextid, 'question', 'partiallycorrectfeedback', $questionid);
-            $fs->delete_area_files($contextid, 'question', 'incorrectfeedback', $questionid);
+        $fs->delete_area_files($contextid, 'question', 'correctfeedback', $questionid);
+        $fs->delete_area_files($contextid, 'question', 'partiallycorrectfeedback', $questionid);
+        $fs->delete_area_files($contextid, 'question', 'incorrectfeedback', $questionid);
     }
 
     public function export_to_xml($question, qformat_xml $format, $extra = null) {
@@ -296,12 +289,12 @@ public function import_from_xml($data, $question, qformat_xml $format, $extra=nu
             $dragindex = $dragno - 1;
             $question->drags[$dragindex] = [];
             $question->drags[$dragindex]['label'] =
-                        $format->getpath($dragxml, array('#', 'text', 0, '#'), '', true);
+                        $format->getpath($dragxml, ['#', 'text', 0, '#'], '', true);
             if (array_key_exists('infinite', $dragxml['#'])) {
                 $question->drags[$dragindex]['noofdrags'] = 0; // Means infinite in the form.
             } else {
                 // Defaults to 1 if 'noofdrags' not set.
-                $question->drags[$dragindex]['noofdrags'] = $format->getpath($dragxml, array('#', 'noofdrags', 0, '#'), 1);
+                $question->drags[$dragindex]['noofdrags'] = $format->getpath($dragxml, ['#', 'noofdrags', 0, '#'], 1);
             }
         }
 
diff --git a/tests/questiontype_test.php b/tests/questiontype_test.php
index 1a08c6d..3a29337 100644
--- a/tests/questiontype_test.php
+++ b/tests/questiontype_test.php
@@ -32,6 +32,7 @@
  * @package    qtype_drawlines
  * @copyright  2024 The Open University
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @covers\qtype_drawlines
  */
 class questiontype_test extends \advanced_testcase {
     /** @var qtype_drawlines instance of the question type class to test. */