diff --git a/tests/Unit/Media/VideoTest.php b/tests/Unit/Media/VideoTest.php
index 8352c45..39c405d 100644
--- a/tests/Unit/Media/VideoTest.php
+++ b/tests/Unit/Media/VideoTest.php
@@ -695,12 +695,13 @@ class VideoTest extends AbstractStreamableTestCase
             ->method('getConfiguration')
             ->will($this->returnValue($configuration));
 
+        $self = $this;
+
         $driver->expects($this->exactly(1))
             ->method('command')
             ->with($this->isType('array'), false, $this->anything())
-            ->will($this->returnCallback(function ($commands, $errors, $listeners) {
-                var_dump($commands);
-                $this->assertTrue(!in_array('-b:v', $commands));
+            ->will($this->returnCallback(function ($commands, $errors, $listeners) use ($self) {
+                $self->assertTrue(!in_array('-b:v', $commands));
             }));
 
         $video = new Video(__FILE__, $driver, $ffprobe);