/**
  * isValid returns boolean values only
  */
 function testNumberVR_isValid_INF()
 {
     $nvr = new NumberValidationRule('A_Number', null);
     $this->assertTrue($nvr->isValid('testNumberVR_isValid_INF', '0.00'));
     $this->assertFalse($nvr->isValid('testNumberVR_isValid_INF', '0.00.00'));
     $this->assertFalse($nvr->isValid('testNumberVR_isValid_INF', '' . log(0)));
 }