Update UploadTest.php

tests/unit/Storage/Validator/UploadTest.php

@@ -12,12 +12,12 @@ class UploadTest extends TestCase
      */
     protected $object = null;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->object = new Upload();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
     }
 
@@ -29,4 +29,4 @@ class UploadTest extends TestCase
         $this->assertEquals($this->object->isValid(__DIR__ . '/../../../resources/disk-b/kitten-2.png'), false);
         $this->assertEquals($this->object->isValid(__FILE__), false);
     }
-}
+}