A proper test is to rebuild the system with the patch and run the tests.
A quick test for this change only is:
```
set -eu
cd libexec/rc/tests
objdir="$(make -V .OBJDIR)"
make
if ! sudo -i -- sh -c "cd $objdir && kyua test"; then
sudo -i -- sh -c "cd $objdir && kyua report --results-file=LATEST --verbose"
fi
```