public function testSlide()
 {
     $object = new RichText();
     $oSlide1 = new Slide();
     $oSlide2 = new Slide();
     $oSlide3 = new Slide();
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setSlide());
     $this->assertNull($object->getSlide());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setSlide($oSlide1, true));
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Slide', $object->getSlide());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setSlide($oSlide2, true));
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Slide', $object->getSlide());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setSlide($oSlide3, true));
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Slide', $object->getSlide());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\AbstractShape', $object->setSlide($oSlide3, true));
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Slide', $object->getSlide());
 }