fix: check result
when determining exit code of ls <filter>
#1986
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Alright, take two (because I didn't realise you can't reopen PRs after force pushing 🤦)
I've chucked an assertion to prevent regression into the first filter test - technically they should all ideally do the check, but I've not worked a lot with tap and this is a simple typo bug that I don't expect would crop up all the time.
Happy to add the assertion to the other tests if desired :)
References
Fixes #1979