From 7c37b56927ef4a6a4768c064efaff3627bbb6e6f Mon Sep 17 00:00:00 2001
From: aoright <102943475+aoright@users.noreply.github.com>
Date: Wed, 19 Aug 2026 13:32:16 +0800
Subject: [PATCH] test: add unit test for JoinMessages with empty connection

Signed-off-by: aoright <102943475+aoright@users.noreply.github.com>
---
 join_test.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/join_test.go b/join_test.go
index 37bb30ff..479eaf1f 100644
--- a/join_test.go
+++ b/join_test.go
@@ -34,3 +34,16 @@ func TestJoinMessages(t *testing.T) {
 		}
 	}
 }
+
+func TestJoinMessagesEmpty(t *testing.T) {
+	var connBuf bytes.Buffer
+	rc := newTestConn(&connBuf, nil, false)
+	var result bytes.Buffer
+	_, err := io.Copy(&result, JoinMessages(rc, ","))
+	if IsUnexpectedCloseError(err, CloseAbnormalClosure) {
+		t.Errorf("unexpected error %v", err)
+	}
+	if result.Len() != 0 {
+		t.Errorf("got %q, want empty", result.String())
+	}
+}