public function testInfo()
 {
     $tbls = array('test1', 'test2', 'test3');
     $q = new SelectQuery($tbls);
     $this->assertEquals(var_export($tbls, true), var_export($q->showTables(), true));
     $condition = new Condition('=', new Field('id'), 1);
     $q->setWhere($condition);
     $this->assertEquals(var_export($condition, true), var_export($q->showConditions(), true));
 }