strign contains in array has a strange behavior

[trasher]

There are several strange behaviors when trying to tests array values from the array asserter.

An example I've just fixed (see glpi-project/glpi@01e3e10).

The $this->array($event->fields)->string['name']->contains('Copy of %s') should have fail because the name is "Copy of test event to clone". Most strange is I have the same code working and not working on different glpi branches, but the same atoum, php, etc... versions (I still cannot explain that).

In GLPI team, several person (incluging myself) already has quite strange issues with assertions on array values; but I cannot give more details, nor always reproducible use case right now.