Unit Testing Private Methods and Properties with PHPUnit

http://www.webtipblog.com/unit-testing-private-methods-and-properties-with-phpunit/

Adding Mockery to Symfony 2.3

http://blog.code4hire.com/2013/07/adding-mockery-to-symfony-2-dot-3/

Unit testing with PHPUnit

http://framework.zend.com/manual/2.1/en/modules/zend.test.phpunit.html http://symfony.com/doc/master/book/testing.html

Unit Testing Tutorial

https://jtreminio.com/tag/phpunit/