diff --git a/index (3).php b/index (3).php
new file mode 100644
index 0000000..e8d0dff
--- /dev/null
+++ b/index (3).php	
@@ -0,0 +1,43 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+
+class Migration {
+    private $pdo;
+
+    public function __construct(PDO $pdo) {
+        $this->pdo = $pdo;
+    }
+
+    public function up() {
+        $sql = "CREATE TABLE users (
+            id INT AUTO_INCREMENT PRIMARY KEY,
+            name VARCHAR(50) NOT NULL,
+            email VARCHAR(100) NOT NULL
+        )";
+        $this->pdo->exec($sql);
+    }
+
+    public function down() {
+        $sql = "DROP TABLE users";
+        $this->pdo->exec($sql);
+    }
+}
+
+class MigrationTest extends TestCase {
+    public function testRollbackMigration() {
+        $pdoMock = $this->getMockBuilder(PDO::class)
+                        ->disableOriginalConstructor()
+                        ->getMock();
+
+        $migrationMock = $this->getMockBuilder(Migration::class)
+                             ->setConstructorArgs([$pdoMock])
+                             ->onlyMethods(['up', 'down'])
+                             ->getMock();
+
+        $migrationMock->expects($this->once())
+                      ->method('down');
+
+        $migrationMock->down();
+    }
+}
\ No newline at end of file