diff --git a/tests/Go/Console/Command/CacheWarmupCommandTest.php b/tests/Go/Console/Command/CacheWarmupCommandTest.php
index f2088319..9b2c52ea 100644
--- a/tests/Go/Console/Command/CacheWarmupCommandTest.php
+++ b/tests/Go/Console/Command/CacheWarmupCommandTest.php
@@ -15,7 +15,7 @@ public function setUp()
 
     public function testItWarmsUpCache()
     {
-        $this->assertFalse(file_exists($this->configuration['cacheDir']));
+        $this->assertFileNotExists($this->configuration['cacheDir']);
 
         $this->warmUp();