It depends on how much you practice. I can read some of the hardest Latin texts (with a dictionary and grammar of course
) and I can write fairly complex sentence, even if they're almost always wrong I feel like I'd still be understood if a Roman read them. On top of this I would have a very very hard time actually speaking a word of the language. Sometimes I remember a line or two of poetry or a sentence from a speech but nothing that could be considered actually speaking. This is because I never took the time to even learn the proper pronunciation of the letters.
As for finding standard tests, I don't know. I found a practice test for German once, I think it was for level B1. This was a few years ago but unless someone has made a large effort it might be hard for you to find one.
On the topic of writing counting towards fluency I just want to point out that there are perfectly normal humans alive to day that can't read a single word but if someone can't speak then they are largely impaired in pretty well any society. What does this mean? not much since these illiterate people speak languages that only the most daring and devoted linguists would attempt, I just thought it was an important thing to point out.