I am trying to write unit tests for libraries/sql.lib.php script. I tried several times to write successful test cases  but I was not successful. I think it is because I am missing some variable initialization. I tried to find where I am missing but I was not successful. I would appreciate if someone can provide me a sample test case for a method (for example PMA_getNewDatabase method in sql.lib.php) or any reference that I can refer to gain the required knowledge. 

Thank you

Regards Supun