1
0
Fork 0
mirror of https://github.com/moby/moby.git synced 2022-11-09 12:21:53 -05:00
moby--moby/layer/empty_test.go
Stephen J Day 7a85579917
*: use opencontainers/go-digest package
The `digest` data type, used throughout docker for image verification
and identity, has been broken out into `opencontainers/go-digest`. This
PR updates the dependencies and moves uses over to the new type.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
2017-01-06 18:48:41 -08:00

46 lines
1 KiB
Go

package layer
import (
"io"
"testing"
"github.com/opencontainers/go-digest"
)
func TestEmptyLayer(t *testing.T) {
if EmptyLayer.ChainID() != ChainID(DigestSHA256EmptyTar) {
t.Fatal("wrong ID for empty layer")
}
if EmptyLayer.DiffID() != DigestSHA256EmptyTar {
t.Fatal("wrong DiffID for empty layer")
}
if EmptyLayer.Parent() != nil {
t.Fatal("expected no parent for empty layer")
}
if size, err := EmptyLayer.Size(); err != nil || size != 0 {
t.Fatal("expected zero size for empty layer")
}
if diffSize, err := EmptyLayer.DiffSize(); err != nil || diffSize != 0 {
t.Fatal("expected zero diffsize for empty layer")
}
tarStream, err := EmptyLayer.TarStream()
if err != nil {
t.Fatalf("error streaming tar for empty layer: %v", err)
}
digester := digest.Canonical.Digester()
_, err = io.Copy(digester.Hash(), tarStream)
if err != nil {
t.Fatalf("error hashing empty tar layer: %v", err)
}
if digester.Digest() != digest.Digest(DigestSHA256EmptyTar) {
t.Fatal("empty layer tar stream hashes to wrong value")
}
}