public function testShadow()
 {
     $object = new RichText();
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setShadow());
     $this->assertNull($object->getShadow());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setShadow(new Shadow()));
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Style\\Shadow', $object->getShadow());
 }