Add content test suite

Add content test suite with test for writer.
Update fs and metadata implementations to use test suite.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

metadata/content.go

@@ -385,13 +385,14 @@ func (nw *namespacedWriter) commit(tx *bolt.Tx, size int64, expected digest.Dige
 		return err
 	}
 
-	timeEncoded, err := status.UpdatedAt.MarshalBinary()
+	timeEncoded, err := time.Now().UTC().MarshalBinary()
 	if err != nil {
 		return err
 	}
 
 	for _, v := range [][2][]byte{
 		{bucketKeyCreatedAt, timeEncoded},
+		{bucketKeyUpdatedAt, timeEncoded},
 		{bucketKeySize, sizeEncoded},
 	} {
 		if err := bkt.Put(v[0], v[1]); err != nil {

metadata/content_test.go

@@ -0,0 +1,30 @@
+package metadata
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	"github.com/boltdb/bolt"
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/content/fs"
+	"github.com/containerd/containerd/content/testsuite"
+)
+
+func TestContent(t *testing.T) {
+	testsuite.ContentSuite(t, "metadata", func(ctx context.Context, root string) (content.Store, func(), error) {
+		// TODO: Use mocked or in-memory store
+		cs, err := fs.NewStore(root)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		db, err := bolt.Open(filepath.Join(root, "metadata.db"), 0660, nil)
+		if err != nil {
+			return nil, nil, err
+		}
+		cs = NewContentStore(db, cs)
+
+		return cs, func() {}, nil
+	})
+}