bill's right. you cannot flunk the test. if doing the typical 8 or 20min test you ride as hard as you can. at the end your performance is translated into your FTP. if using zwift's step ftp test you ride until you fail but fail means you cannot ride anymore. this is different, your target power level increases until you cannot turn the cranks anymore. then ftp is calculated.
so, what makes you think you failed?