But then we are back at example/oracle based testing, the beauty of this and pbt is the fact that no matter the input, it should always be what you expected.

I did have hard time follow the audio example, he references a paper about api testing (didn’t have the time to read the whole thing) but the examples there are quite good.

for example:

Doing a query requesting YouTube video’s but with location personalization.

A query of New York center with a 50km range, should always be equal or less then the same query with a 25km/15/5 range.

This would be true for every search query.

That said, I we still having a hard time using PBT, and metamorphic testing seems like a subset of it. It will take a while before the industry gets there.