Initial commit

vendor/github.com/hyperhq/hypercli/layer/empty_test.go

@@ -0,0 +1,46 @@
+package layer
+
+import (
+	"io"
+	"testing"
+
+	"github.com/docker/distribution/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.New()
+	_, 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")
+	}
+}