public function testFilterBy()
 {
     foreach (BookTableMap::getFieldNames(TableMap::TYPE_PHPNAME) as $colName) {
         $filterMethod = 'filterBy' . $colName;
         $this->assertTrue(method_exists('\\Propel\\Tests\\Bookstore\\BookQuery', $filterMethod), 'QueryBuilder adds filterByColumn() methods for every column');
         $q = BookQuery::create()->{$filterMethod}(1);
         $this->assertTrue($q instanceof BookQuery, 'filterByColumn() returns the current query instance');
     }
 }