There might be no block device in chroot environment (e.g. mock on Fedora).
Please let me know if there might be some other preferred solution, e.g. filter for some tests for mock in Fedora or using tags.
This change is not acceptable. Consider writing a proper RubySpec guard for block devices (eg with_block_device).
Ignore block device test.
I made pull request to add the "with_block_device" guard  and updated this pull request to use it.