test(ncls): test own non-enumerable props @W-16109991@

[wjhsf]

Details

I committed and pushed and merged #4337. But I hadn't staged the file I had wanted to commit! So now we have a second PR to add one dinky little test. 🤦

Does this pull request introduce a breaking change?

• 😮‍💨 No, it does not introduce a breaking change.
• 💔 Yes, it does introduce a breaking change.

Does this pull request introduce an observable change?

• 🤞 No, it does not introduce an observable change.
• 🔬 Yes, it does include an observable change.

GUS work item