MAGETWO-29705: Fixed confusing Filesystem Read/Write Interfaces

Author: Joan He

dev/tests/unit/testsuite/Magento/Downloadable/Helper/DownloadTest.php

@@ -226,7 +226,7 @@ protected function _setupUrlMocks($size = self::FILE_SIZE, $url = self::URL, $ad
         $this->fileReadFactory->expects(
             $this->once()
         )->method(
-            'createWithDriverCode'
+            'create'
         )->will(
             $this->returnValue($this->_handleMock)
         );