.

wcfs/internal/xbtree/δbtail_test.go

@@ -739,10 +739,12 @@ func xverifyΔBTail_Update1(t *testing.T, subj string, db *zodb.DB, treeRoot zod
 
 	δB, err  := δbtail.Update(δZ);     X(err)
 
+	if δB.Rev != δZ.Tid {
+		badf("δB: rev != δZ.Tid  ; rev=%s  δZ.Tid=%s", δB.Rev, δZ.Tid)
+		return
+	}
+
 	// assert δBtail[root].vδT = δBtail_[root].vδT
-	//
-	// NOTE we don't verify .roots because δB1.roots always has treeRoot because
-	// for debugging δtkeycov information is always recorded, even if empty.
 	var vδT, vδT_ []ΔTree
 	if δttail, ok := δbtail.byRoot[treeRoot]; ok {
 		vδT = δttail.vδT
@@ -754,11 +756,6 @@ func xverifyΔBTail_Update1(t *testing.T, subj string, db *zodb.DB, treeRoot zod
 		badf("δBtail.vδT differs after Update and _Update1:\n_Update1: %v\n  Update: %v", vδT_, vδT)
 	}
 
-	if δB.Rev != δZ.Tid {
-		badf("δB: rev != δZ.Tid  ; rev=%s  δZ.Tid=%s", δB.Rev, δZ.Tid)
-		return
-	}
-
 	// verify δbtail.trackSet  against @at2
 	δbtail.assertTrack(t, "2", trackSet2, ø)