function testTransientForceFilter()
 {
     $transient = $this->_generate_transient_name();
     TimberHelper::_lock_transient($transient, 30);
     add_filter('timber_force_transient_' . $transient, '__return_true');
     $get_transient = TimberHelper::transient($transient, '__return_true');
     remove_filter('timber_force_transient_' . $transient, '__return_true');
     $this->assertTrue($get_transient);
 }