public function testGetSetProperties()
{
$object = new PhpProject();
$oProperties = new DocumentProperties();
$this->assertInstanceOf('PhpOffice\\PhpProject\\DocumentProperties', $object->getProperties());
$this->assertInstanceOf('PhpOffice\\PhpProject\\PhpProject', $object->setProperties($oProperties));
$this->assertInstanceOf('PhpOffice\\PhpProject\\DocumentProperties', $object->getProperties());
}