do not end in period

Author: bshaffer

tests/Cache/FileSystemCacheItemPoolTest.php

@@ -208,7 +208,7 @@ public function testSimpleTempdirCacheWriteOnWindows()
             'myawesomeproject',
             'myinstance',
             '21995090',
-            '',
+            'foo',
         );
         $cacheItem = $pool->getItem($cacheKey);
         $cacheItem->set('foo');