From c23c5c47aa6ab36814170ec2918ee01697bda26c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=BA=90=E6=96=87=E9=9B=A8?=
 <41315874+fumiama@users.noreply.github.com>
Date: Sat, 1 Mar 2025 01:04:30 +0900
Subject: [PATCH] feat(pbuf): add copy test

---
 pbuf/buffer_test.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/pbuf/buffer_test.go b/pbuf/buffer_test.go
index 9cbdb32..45fb60a 100644
--- a/pbuf/buffer_test.go
+++ b/pbuf/buffer_test.go
@@ -17,6 +17,22 @@ func TestBuffer(t *testing.T) {
 	testBuffer(InvolveBuffer(bytes.NewBuffer(make([]byte, 0, 8192))), t)
 }
 
+func TestUserBufferCopy(t *testing.T) {
+	p := NewBufferPool[int64]()
+	buf := p.NewBuffer(nil)
+	buf.P(func(ub *UserBuffer[int64]) {
+		ub.DAT = 123456
+		ub.WriteString("0987654321")
+	})
+	cpd := buf.Copy().Trans()
+	if cpd.DAT != 123456 {
+		t.Fatal("exp", 123456, "got", cpd.DAT)
+	}
+	if !bytes.Equal(cpd.Bytes(), []byte("0987654321")) {
+		t.Fail()
+	}
+}
+
 func testBuffer(buf *OBuffer, t *testing.T) {
 	buf.P(func(buf *Buffer) {
 		if buf.Len() != 4096 {