ul li1 VfsStream effective filesystem mocking Sebastian Marekli ul p2 Prerequisitesp ul lisome experience in unit testingli ul p3 basic knowledge of PHPUnit 4 External dependenciesp ul lidatabaseli ul p5 SOAP 6 3 rdparty 7 Filesystemp ul liEasy to set upli ul p8 Many different ways 9 Not a dependency REALLY! 10 Learning by examplep