Fixed test docs

CONTRIBUTING.md

@@ -28,9 +28,7 @@ We accept contributions via Pull Requests on [Github](https://github.com/2amigos
 
 ## Running Tests
 
-``` bash
-$ ./vendor/bin/phpunit
-```
+See the *Running Tests* section on the [docs](http://yii2-usuario.readthedocs.io/en/latest/contributing/clean-code/).
 
 
 **Happy coding**!

docs/contributing/clean-code.md

@@ -47,12 +47,12 @@ For further information, please visit [FriendsOfPHP/PHP-CS-Fixer](https://github
 Running Tests
 -------------
 
-We are using `Codeception` for testing the module. Do the following: 
+We are using `Codeception` for testing the module. To run tests do the following: 
 
 - Create a `yii2-usuario-test` database. 
-- Add database access configuration `tests/_app/config/db.php` 
+- Add database access configuration in `tests/_app/config/db.php` (or create `db.local.php` in the same directory) and `codeception.dist.yml`.
 - Run `./vendor/bin/codecept build`
-- Run `./vendor/bin/codecept functional`
+- Run `./vendor/bin/codecept run`
 
 We still need to add `unit` tests to the module. Feel free to add your tests to it as long as it makes use of 
 `Codeception`.