fix indentation

Author: aleromano89

app/code/Magento/Downloadable/Test/Unit/Helper/DownloadTest.php

@@ -17,10 +17,10 @@
  */
 class DownloadTest extends \PHPUnit\Framework\TestCase
 {
-	/** @var array Result of get_headers() function */
-	public static $headers;
+    /** @var array Result of get_headers() function */
+    public static $headers;
 
-	/** @var DownloadHelper */
+    /** @var DownloadHelper */
     protected $_helper;
 
     /** @var Filesystem|\PHPUnit_Framework_MockObject_MockObject */
@@ -233,7 +233,7 @@ protected function _setupUrlMocks($size = self::FILE_SIZE, $url = self::URL, $ad
             $this->returnValue($this->_handleMock)
         );
 
-		self::$headers = ['200 OK'];
+        self::$headers = ['200 OK'];
         $this->_helper->setResource($url, DownloadHelper::LINK_TYPE_URL);
     }
 

app/code/Magento/Downloadable/Test/Unit/_files/download_mock.php

@@ -30,5 +30,5 @@ function mime_content_type()
  */
 function get_headers()
 {
-	return DownloadTest::$headers;
+    return DownloadTest::$headers;
 }