public function testCountNumberOfItemsWithCategory()
 {
     $doc = new XmlDocument();
     $doc->load(self::samplesDir() . 'categories.xml');
     $this->assertEquals(2, TestCategoryRulesUtils::CountNumberOfItemsWithCategory($doc->getDocumentComponent(), 'math'));
     $this->assertEquals(2, TestCategoryRulesUtils::CountNumberOfItemsWithCategory($doc->getDocumentComponent(), 'english'));
     $this->assertEquals(0, TestCategoryRulesUtils::CountNumberOfItemsWithCategory($doc->getDocumentComponent(), 'X'));
 }