You can't test for a particular outcome given an unknown set of input data. If you have a known snapshot of data, you can set expectations for how you want you

You can't test for a particular outcome given an unknown set of input data. If you have a known snapshot of data, you can set expectations for how you want your system to behave under those circumstances. If you create a world where IMDB would rank highest for your indexing algorithm for the term "avatar", then you can expect that when you run a search it will be returned as the first result.