If you want do do a full end to end test then use rclone check --download - that will download all the data and check the checksums which works for any backend whether they support checksums or not.
Depending on exactly how you've set up chunker, it may be storing checksums for you so rclone check may work just fine.
I don't think you can use rclone cryptcheck if it isn't the top remote. So if you want to use rclone cryptcheck you might need to wrap them the other way round Crypt -> Chunker -> B2.
Anyway try rclone check first - it will tell you about missing files and if checksums aren't working it will tell you.