added test for ArrayHelper::multisort() with closure key

related to #13248

tests/framework/helpers/ArrayHelperTest.php

@@ -298,6 +298,32 @@ class ArrayHelperTest extends TestCase
         $this->assertEquals(['name' => 'b', 'age' => 3], $array[2]);
     }
 
+    public function testMultisortClosure()
+    {
+        $changelog = [
+            '- Enh #123: test1',
+            '- Bug #125: test2',
+            '- Bug #123: test2',
+            '- Enh: test3',
+            '- Bug: test4',
+        ];
+        $i = 0;
+        ArrayHelper::multisort($changelog, function($line) use (&$i) {
+            if (preg_match('/^- (Enh|Bug)( #\d+)?: .+$/', $line, $m)) {
+                $o = ['Bug' => 'C', 'Enh' => 'D'];
+                return $o[$m[1]] . ' ' . (!empty($m[2]) ? $m[2] : 'AAAA' . $i++);
+            }
+            return 'B' . $i++;
+        }, SORT_ASC, SORT_NATURAL);
+        $this->assertEquals([
+            '- Bug #123: test2',
+            '- Bug #125: test2',
+            '- Bug: test4',
+            '- Enh #123: test1',
+            '- Enh: test3',
+        ], $changelog);
+    }
+
     public function testMerge()
     {
         $a = [