1 files changed, 12 insertions, 0 deletions
diff --git a/core/test/utils.go b/core/test/utils.go
index 8a14ebf..d85395b 100644
--- a/core/test/utils.go
+++ b/core/test/utils.go
@@ -244,3 +244,15 @@ func LaunchDummyReceiver(
 	}()
 	return dummyCancel
 }
+
+func getComplementSet(
+	all, set map[types.NodeID]struct{}) map[types.NodeID]struct{} {
+	complement := make(map[types.NodeID]struct{})
+	for nID := range all {
+		if _, exists := set[nID]; exists {
+			continue
+		}
+		complement[nID] = struct{}{}
+	}
+	return complement
+}