xdebug/blog/vendor/phpunit/php-code-coverage/tests/_files/CoveredClass.php

<?php
class CoveredParentClass
{
    private function privateMethod()
    {
    }

    protected function protectedMethod()
    {
        $this->privateMethod();
    }

    public function publicMethod()
    {
        $this->protectedMethod();
    }
}

class CoveredClass extends CoveredParentClass
{
    private function privateMethod()
    {
    }

    protected function protectedMethod()
    {
        parent::protectedMethod();
        $this->privateMethod();
    }

    public function publicMethod()
    {
        parent::publicMethod();
        $this->protectedMethod();
    }
}