user49981

abstract class AbstractClass
{
    protected function request($body)
    {
        return Document::TEST_VALUE;
    }
}

class Document extends AbstractClass
{
    const TEST_VALUE = 403;

    public function handle($params)
    {
        $requestBody = 'body';
        return $this->request($requestBody);
    }
}

class DocumentTest
{
    public function testRequest()
    {
        $doc = new Document();
        $result = $this->invokeMethod($doc, 'request', [1]);
        self::assertEquals(Document::TEST_VALUE, $result);
    }

    private function invokeMethod(&$object, $methodName, array $parameters = array())
    {
        $reflection = new \ReflectionClass(get_class($object));
        $method = $reflection->getMethod($methodName);
        $method->setAccessible(true);

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