.

wcfs/δbtail_test.go

@@ -1035,7 +1035,13 @@ func TestΔBTail(t *testing.T) {
 		"T/T1/T-T/B0:g-B1:e,2:d,3:h",
 		"T1/T-T3/B0:g-T-T/B1:e,2:d-B3:h",
 
-		// was leading to wrongly computed trackIdx2
+		// was leading to wrongly computed trackIdx2 due to top not
+		// being tracked to tree root.
+		"T/T1/B0:a-B1:b",
+		"T/T1/T-T/B0:c-B1:d",
+
+		// found by AllStructs (trackIdx2 wrongly computed due to top
+		// not being tracked to tree root)
 		"T2/T1-T/B0:g-B1:b-T/B2:b,3:a",
 		"T2/T1-T/T-T-B2:a/B0:c-B1:g",
 	}