file_exists check

tests/PHPUnit/Framework/TestingEnvironmentVariables.php

@@ -43,7 +43,9 @@ class TestingEnvironmentVariables
     {
         $includePath = __DIR__ . '/../../..';
 
-        @mkdir($includePath . '/tmp');
+        if(!file_exists($includePath . '/tmp')){
+            mkdir($includePath . '/tmp');
+        }
 
         $overridePath = $includePath . '/tmp/testingPathOverride.json';
         file_put_contents($overridePath, json_encode($this->behaviorOverrideProperties));