Merge pull request #41 from codemasher/fix-teardown

proper check instead using the @-operator

Author: shadowhand

test/StreamHelper.php

@@ -27,7 +27,9 @@ protected function createTemporaryResource($content = null)
     public static function tearDownAfterClass(): void
     {
         foreach (static::$tempFiles as $tempFile) {
-            @unlink($tempFile);
+            if (is_file($tempFile)) {
+                unlink($tempFile);
+            }
         }
     }
 }