Update GZIPTest.php

tests/unit/Storage/Compression/Algorithms/GZIPTest.php

@@ -12,12 +12,12 @@ class GZIPTest extends TestCase
      */
     protected $object = null;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->object = new GZIP();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
     }
 
@@ -77,4 +77,4 @@ class GZIPTest extends TestCase
         
         $this->assertEquals($dataSize, 3038056);
     }
-}
+}