/**
  * constructor sets a sane default date format string ('Y-m-d')
  */
 function testDateVR_construct_format()
 {
     $dvr = new DateValidationRule('DateValidator');
     $this->assertTrue($dvr->getValid('testDateVR_construct_format', '1970-01-31')->format('Y-m-d') == '1970-01-31');
 }