tests output multiple lines to stderr

[ceremcem]

Tests outputs those messages to the stderr:

$ ./tests.sh > test.txt
ERROR: Could not open: No such file or directory
At subvol btrfs-diff-tests.child
Found a valid Btrfs stream header, version 1
At subvol btrfs-diff-tests.child
Found a valid Btrfs stream header, version 1
./tests.sh: line 51: jq: command not found
At subvol btrfs-diff-tests.child
Found a valid Btrfs stream header, version 1
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe

Expected

No output should be observed in stderr.

[sysnux]

Done, thanks for hint.