Sinclair Broadcast Group Software Development Engineer In Test interview questions

First interviewer asked me questions that were impossible to answer - namely, how to generate test cases for, and test, an API where there were no defined inputs or outputs. I kept asking for such information, but it was just shrugged off. The interviewer also seemed harried; like he wanted/needed to be anywhere else. The second and third people with whom I spoke were more reasonable - the experience went well. I didn't get a second interview as (according to the feedback received by the recruiter) they wanted someone with "more testing knowledge". Right. I've been testing software for more than 20 years. I at least know that without a definite input and output for an API there can be no pass or fail and thus no viable test case.