The test case would check if "btrfs subvolume create":
- Report error on an existing path
- Still report error if mulitple paths are given and one of them already
exists
- For above case, still created a subvolume for the good parameter
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>