Imports of package testutils

PathSynopsis
github.com/docker/docker/pkg/archivePackage archive provides helper functions for dealing with archive files.
github.com/opencontainers/go-digestPackage digest provides a generalized type to opaquely represent message digests and their operations within the registry.
ioPackage io provides basic interfaces to I/O primitives.
testingPackage testing provides support for automated testing of Go packages.