chore(changelog): add test for addition of trailing newline - #10358

CLAs look good, thanks!

are we actually able to run these tests anymore? node_modules/.bin/jasmine-node changelog.spec.js throws --- some problem loading the lunr.js test helper, which we apparently need?

I don't think we need the lunr helper.
I was able to run the tests using jasmine-node's --nohelpers switch:

jasmine-node --nohelpers changelog.spec.js

weird, huh

anyway, land it I guess, it looks okay to me

wait, actually no --- one of these tests fails

I had a not in the expectation that shouldn't be there. Fixed.
_{(It was a left-over from my testing that the tests are actually executed 😄)}

yep, just tried it and it's green, lgtm

merg'd

in the future, commits which are just tests use the test(....): ... notation, per the commit message guidelines --- but it doesn't matter much