I resolved this issue by deleting non useful Security Test like "MobileSecurityTest". So before testing your adapter make sure that your declaration in the "authenticationConfig.xml" file is well done. For more information about that, you can visit this URL :
In addition, you have to figure out the root response in the adapter response to see first how looks your received data, otherwise you may be will receive a "NullPointerException" as response if you attempt to get for example "response.result" and the attribut "result" doesn't exist.
Hope that help you for future issues like I got.