>> Seem quite unnecessary. We haven't found that to be an issue elsewhere
>> in the code where slurp_file is used. And in the present case we know
>> the file exists because we got its name from list_files().
>
> Agreed.  That's an exchange between a hard failure mid-test and a
> failure while letting the whole test run.  Here, we expect the test to
> find the log file all the time, so a hard failure does not sound like
> a bad thing to me either.
Ok, fine with me!
-- 
Fabien.