Run snapshot test suite for metadata and client

The snapshot test suite is designed to run against the snapshotter
interface, run the test suite for metadata and client implementations
of the snapshotter interface.

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

metadata/snapshot_test.go

@@ -0,0 +1,42 @@
+package metadata
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/boltdb/bolt"
+	"github.com/containerd/containerd/snapshot"
+	"github.com/containerd/containerd/snapshot/naive"
+	"github.com/containerd/containerd/snapshot/testsuite"
+	"github.com/containerd/containerd/testutil"
+)
+
+func newSnapshotter(ctx context.Context, root string) (snapshot.Snapshotter, func(), error) {
+	naiveRoot := filepath.Join(root, "naive")
+	if err := os.Mkdir(naiveRoot, 0770); err != nil {
+		return nil, nil, err
+	}
+	snapshotter, err := naive.NewSnapshotter(naiveRoot)
+	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
+	}
+
+	sn := NewSnapshotter(db, "naive", snapshotter)
+
+	return sn, func() {
+		db.Close()
+	}, nil
+}
+
+func TestMetadata(t *testing.T) {
+	// Snapshot tests require mounting, still requires root
+	testutil.RequiresRoot(t)
+	testsuite.SnapshotterSuite(t, "Metadata", newSnapshotter)
+}