run-tests.fish executes under the config it tests, which shadows cp, rm
and cat. The real hazard is cp: the config aliases it to 'cp -i', which on
a non-empty destination reads EOF in a non-interactive runner, silently
skips the copy and exits 0 -- a sandbox missing config files, reported as
success.
rm -rf and cat were measured and behave correctly as-is (the rm wrapper
bails to command rm on any non-recursive flag, so -rf really deletes and
does not trash). Prefixed anyway: a test runner must not depend on the
configuration under test.
rootiest
8fc27fa9c2