In V2, when I entered a JS function decoder, there was a way to send it test data and a place to see the results from the decoder test…
How do we do this in V3???
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You can’t 
You can write your own .js. The down part after
// Print the final result: is not part of the decoder. There you can add testing data (ttnbytes) and the following codes.
Of course you must omit <script> and </script> tags.
We have some open issues related to this on GitHub:
- Payload format testing · Issue #2232 · TheThingsNetwork/lorawan-stack · GitHub
- Add syntax validation for payload formatters · Issue #3442 · TheThingsNetwork/lorawan-stack · GitHub
If this is important to you, you can add a 
on those issues. The team uses those 's to prioritize what we’re working on. Also, if you’re interested in contributing this feature, please leave a comment on the GitHub issue.
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