diff --git a/merkledag/merkledag_test.go b/merkledag/merkledag_test.go
index 2739e2195..430e31f7a 100644
--- a/merkledag/merkledag_test.go
+++ b/merkledag/merkledag_test.go
@@ -32,13 +32,6 @@ type dagservAndPinner struct {
 	mp pin.Pinner
 }
 
-func getDagserv(t *testing.T) DAGService {
-	db := dssync.MutexWrap(ds.NewMapDatastore())
-	bs := bstore.NewBlockstore(db)
-	blockserv := bserv.New(bs, offline.Exchange(bs))
-	return NewDAGService(blockserv)
-}
-
 func getDagservAndPinner(t *testing.T) dagservAndPinner {
 	db := dssync.MutexWrap(ds.NewMapDatastore())
 	bs := bstore.NewBlockstore(db)
@@ -253,7 +246,7 @@ func assertCanGet(t *testing.T, ds DAGService, n *Node) {
 }
 
 func TestEmptyKey(t *testing.T) {
-	ds := getDagserv(t)
+	ds := dstest.Mock()
 	_, err := ds.Get(context.Background(), key.Key(""))
 	if err != ErrNotFound {
 		t.Error("dag service should error when key is nil", err)