public function testSlideBackground()
{
$oPhpPresentation = new PhpPresentation();
$oSlide = $oPhpPresentation->getActiveSlide();
$oBkgImage = new Image();
$oBkgImage->setPath(PHPPRESENTATION_TESTS_BASE_DIR . '/resources/images/PhpPresentationLogo.png');
$oSlide->setBackground($oBkgImage);
$pres = TestHelperDOCX::getDocument($oPhpPresentation, 'ODPresentation');
$element = '/manifest:manifest/manifest:file-entry[5]';
$this->assertTrue($pres->elementExists($element, 'META-INF/manifest.xml'));
$this->assertEquals('Pictures/' . str_replace(' ', '_', $oBkgImage->getIndexedFilename(0)), $pres->getElementAttribute($element, 'manifest:full-path', 'META-INF/manifest.xml'));
}