PhpOffice\PhpPresentation\Tests\Writer\PowerPoint2007\SlideTest::testVisibility PHP Method

    public function testVisibility()
    {
        $expectedElement = '/p:sld';
        $oPhpPresentation = new PhpPresentation();
        $pres = TestHelperDOCX::getDocument($oPhpPresentation, 'PowerPoint2007');
        $this->assertTrue($pres->elementExists($expectedElement, 'ppt/slides/slide1.xml'));
        $this->assertFalse($pres->attributeElementExists($expectedElement, 'show', 'ppt/slides/slide1.xml'));
        $oSlide = $oPhpPresentation->getActiveSlide();
        $oSlide->setIsVisible(false);
        $pres = TestHelperDOCX::getDocument($oPhpPresentation, 'PowerPoint2007');
        $this->assertTrue($pres->elementExists($expectedElement, 'ppt/slides/slide1.xml'));
        $this->assertTrue($pres->attributeElementExists($expectedElement, 'show', 'ppt/slides/slide1.xml'));
        $this->assertEquals(0, $pres->getElementAttribute($expectedElement, 'show', 'ppt/slides/slide1.xml'));
    }