Update LocalTest.php

tests/unit/Storage/Device/LocalTest.php

@@ -12,12 +12,12 @@ class LocalTest extends TestCase
      */
     protected $object = null;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->object = new Local(realpath(__DIR__ . '/../../../resources/disk-a'));
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
     }
 
@@ -120,4 +120,4 @@ class LocalTest extends TestCase
     {
         $this->assertGreaterThan(0, $this->object->getPartitionTotalSpace());
     }
-}
+}