.

wcfs/δbtail_test.go

@@ -320,6 +320,9 @@ func XGetTree(db *zodb.DB, at zodb.Tid, root zodb.Oid) RBucketSet {
 	xwalkDFS(ctx, -kInf, kInf, ztree, func(rb *RBucket) {
 		rbucketv = append(rbucketv, rb)
 	})
+	if len(rbucketv) == 0 { // empty tree -> [-∞, ∞){}
+		rbucketv = RBucketSet{&RBucket{-kInf, kInf, map[Key]string{}}}
+	}
 	return rbucketv
 }