infinito/application/tests/AbstractTestCase.php

<?php

namespace App\Tests;

use PHPUnit\Framework\TestCase;

abstract class AbstractTestCase extends TestCase
{
    /**
     * Call protected/private method of a class.
     *
     * @see https://jtreminio.com/blog/unit-testing-tutorial-part-iii-testing-protected-private-methods-coverage-reports-and-crap/
     *
     * @param object &$object    Instantiated object that we will run method on
     * @param string $methodName Method name to call
     * @param array  $parameters array of parameters to pass into method
     *
     * @return mixed method return
     */
    public function invokeMethod(&$object, $methodName, array $parameters = [])
    {
        $reflection = new \ReflectionClass(get_class($object));
        $method = $reflection->getMethod($methodName);
        $method->setAccessible(true);

        return $method->invokeArgs($object, $parameters);
    }
}