Fix test by make sorting independent of locale and case

[pabzm]

These tests have been failing locally repeatedly. This fixes them and also works in the CI.

[pabzm]

@alecpl Do you have a comment on this? I'm not really sure why you chose a case-sensitive comparing function in the first place.

[alecpl]

We use strcoll because it is locale-aware.

[pabzm]

But then we cannot compare its output with a fixed list, right? Because the output depends on the locale?

[alecpl]

The solution is to set locale in the test.

[pabzm]

I tried without success.

putenv('LANG=C');
putenv('LC_ALL=C');
$_ENV['LANG'] = 'C';
$_ENV['LC_ALL'] = 'C';
setlocale(\LC_ALL, 'C');

These all don't help, neither with C.UTF-8 nor en_US.UTF-8. Which one is correct needle for this haystack?

I still don't understand what we gain from depending our test result on one specific locale, which we then have to pin in our test?

[alecpl]

The test works with setlocale(\LC_ALL, 'en_US.UTF-8'), but you have to have this locale installed in the system. It fails with 'C' locale.

Feel free to modify the test to pass (e.g. use upper-case where needed), but I don't think we should change the sorting algorithm.

[pabzm]

Does this work for you?