@stof @fabpot So how you want tests for dumper to be handled? Currently it checks format of file, so it take things like indentation into account - which in my opinion is good, because we test dumper, and it should be human readable. 

Proposed solutions from my side:

1. If php < 5.4 then mark test as skipped
2. Make two tests - for <= 5.3 and second for newer versions, and mark them skipped depending on PHP version. Then when running on 5.4 , test for 5.3 (which compares non human readable format) will be skipped, and for running on 5.3 test for 5.4 will be skipped.
3. Instead of checking file format, parse file and check parsed data structure, but for me it not good test case for dumper (look above)
4. ?