@Aber28 Cadence is a pretty personal thing, but I like to test at 100 as I tend to be ok on cardio and it keeps the legs fresher. Worth noting though that my natural cadence is around 95-97. So I tend to go a tiny bit faster with the legs on a test (I do the same thing in TTs)
This is my most recent test: Log In to TrainerRoad
You can see I’m averaging around 100 cadence for the entire ramp portion
This is the ride I did last night: Log In to TrainerRoad
You can see without any emphasis on cadence I am sitting in the mid 90s (getting progressively slower as I got more fatigued).
So I guess to answer your question I’d say - if your normal rides find you riding at 80 cadence then testing at 80 isn’t a bad idea, but in general faster cadences are better as it transfers more of the burden to your cardio (burdens slower and recovers faster) and away from your muscles. So, by all means test at a cadence similar to what you naturally ride, but work to increase your standard cadence during the other rides (I find it particularly helpful to focus on a fast cadence on easier days)