Trait for PHPUnit private methods tests

PrivateTrait.php

<?php
namespace Test;

trait PrivateTrait
{
    /**
     * @param string|Object $obj Object
     * @param string $name Method Name
     * @param array $args
     * @return mixed its based on method result;
     */
    public function callPrivateMethod($obj, $name, array $args = array())
    {
        $class = new \ReflectionClass($obj);
        $method = $class->getMethod($name);
        $method->setAccessible(true);
        return $method->invokeArgs($obj, $args);
    }
}

SampleTest.php

<?php

namespace Test;

class SampleTest extends \PHPUnit_Framework_TestCase
{
    use PrivateTrait;

    public function testFooGettingBar()
    {
        $result = $this->callPrivateMethod(new Foo(), 'getBar', ['1']);
        //...
    }

}