diff --git a/tests/Runtime/RuntimeMockup.php b/tests/Runtime/RuntimeMockup.php
index e5377b4..65b6c32 100644
--- a/tests/Runtime/RuntimeMockup.php
+++ b/tests/Runtime/RuntimeMockup.php
@@ -26,7 +26,7 @@ class RuntimeMockup extends Runtime
 
     public function getRanCommandTimeoutFor($cmd)
     {
-        return $this->ranCommandTimeouts[$cmd] ?? null;
+        return isset($this->ranCommandTimeouts[$cmd]) ? $this->ranCommandTimeouts[$cmd] : null;
     }
 
     /**
diff --git a/tests/Task/BuiltIn/Symfony/AsseticDumpTaskTest.php b/tests/Task/BuiltIn/Symfony/AsseticDumpTaskTest.php
index b481f47..e1f694e 100644
--- a/tests/Task/BuiltIn/Symfony/AsseticDumpTaskTest.php
+++ b/tests/Task/BuiltIn/Symfony/AsseticDumpTaskTest.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php
 
 namespace Mage\tests\Task\BuiltIn\Symfony;