Drupal7 SimpleTest and Testing modules

Testing modules must be done as often as possible when you write code or change settings.  
Let’s start by running a test!  Enable the Testing module, then go to Configuration > Development > Testing. You must tick the module you want to test, then, click Run tests. After a few minutes, the test results are displayed.
https://drupal.org/documentation/modules/simpletest
https://drupal.org/node/1074360