From c32eedee364ec8f3affc8a1217521c23d59db35b Mon Sep 17 00:00:00 2001
From: mkassaei <m.kassaei@open.ac.uk>
Date: Wed, 15 Nov 2023 15:18:05 +0000
Subject: [PATCH] Matrix: Add the get_num_correct_choices function #739047

---
 question.php                     | 13 +++++++++++++
 tests/question_multiple_test.php |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/question.php b/question.php
index 8bbd2a7..1bb5717 100644
--- a/question.php
+++ b/question.php
@@ -462,4 +462,17 @@ public function get_num_selected_choices(array $response): int {
         }
         return $numselected;
     }
+
+    /**
+     * Returns the count of correct answers for the question.
+     *
+     * @return int the number of choices that are correct.
+     */
+    public function get_num_correct_choices(): int {
+        $numcorrect = 0;
+        foreach ($this->rows as $row) {
+            $numcorrect += count($row->correctanswers);
+        }
+        return $numcorrect;
+    }
 }
diff --git a/tests/question_multiple_test.php b/tests/question_multiple_test.php
index c02bb7c..dab1c8d 100644
--- a/tests/question_multiple_test.php
+++ b/tests/question_multiple_test.php
@@ -354,4 +354,11 @@ public function test_get_num_parts_grade_partial(): void {
         // Two responsess are given and both are correct (Second and third row have not been answered).
         $this->assertEquals([2, 7], $question->get_num_parts_grade_partial(['rowanswers0_1' => '1', 'rowanswers0_3' => '1']));
     }
+
+    public function test_get_num_correct_choices(): void {
+        $question = \test_question_maker::make_question('oumatrix', 'food_multiple');
+
+        // Correct number of choices are expected.
+        $this->assertEquals(7, $question->get_num_correct_choices());
+    }
 }