generic: Add small copies to new file test

This test copies single bytes from a source file into various new
files just to make sure that we can handle very small copies.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
3 files changed