Add unit tests for replaceMatches method (#48771)

Author: salehhashemi1992

tests/Support/SupportStringableTest.php

@@ -1187,6 +1187,21 @@ public function testStripTags()
         $this->assertSame('<strong>before</strong><br>after', (string) $this->stringable('<strong>before</strong><br>after')->stripTags('<br><strong>'));
     }
 
+    public function testReplaceMatches()
+    {
+        $stringable = $this->stringable('Hello world!');
+        $result = $stringable->replaceMatches('/world/', function ($match) {
+            return strtoupper($match[0]);
+        });
+
+        $this->assertSame('Hello WORLD!', $result->value);
+
+        $stringable = $this->stringable('apple orange apple');
+        $result = $stringable->replaceMatches('/apple/', 'fruit', 1);
+
+        $this->assertSame('fruit orange apple', $result->value);
+    }
+
     public function testScan()
     {
         $this->assertSame([123456], $this->stringable('SN/123456')->scan('SN/%d')->toArray());