.

wcfs/internal/xbtree/δbtail_test.go

@@ -947,10 +947,6 @@ func (δBtail *ΔBtail) assertTrack(t *testing.T, subj string, trackSetOK PPTree
 //
 // It also exercises rebuild phase of ΔBtail.Update.
 func xverifyΔBTail_rebuild(t *testing.T, db *zodb.DB, treeRoot zodb.Oid, t0, t1, t2 *tTreeCommit) {
-	// XXX handle DEL
-	// XXX Update -> Track -> rebuild ...
-	// XXX can start with non-existing tree
-
 //	t1 := t2.prev
 //	t0 := t1.prev
 	t.Run(fmt.Sprintf("rebuild/%s→%s", t0.tree, t1.tree), func(t *testing.T) {
@@ -1001,8 +997,9 @@ func xverifyΔBTail_rebuild(t *testing.T, db *zodb.DB, treeRoot zodb.Oid, t0, t1
 				// assert trackSet=ø, trackNew=ø, vδB=[]
 				δbtail.assertTrack(t, "@at0", ø, ø)  // XXX + vδB
 
-				xverifyΔBTail_rebuild_U(t, δbtail, db, treeRoot, t0, t1, xat, /*trackSet=*/ø)
-				// XXX ^^^ + vδT=ø
+				xverifyΔBTail_rebuild_U(t, δbtail, db, treeRoot, t0, t1, xat,
+					/*trackSet=*/ø,
+					/*vδT=ø*/)
 				xverifyΔBTail_rebuild_TR(t, db, δbtail, t1, treeRoot, xat,
 					// after Track(keys1)
 					keys1,