From 03ed5d970b66fd3429311497192e6b44ecb4f193 Mon Sep 17 00:00:00 2001
From: Chris Kennelly <ckennelly@google.com>
Date: Fri, 25 Oct 2024 09:54:03 -0700
Subject: [PATCH] Directly test calling ByteSizeLong() on default instances.

These instances may be in `.rodata`, so ByteSizeLong() cannot write to the
_cached_size_.  The call itself should succeed.

PiperOrigin-RevId: 689822451
---
 src/google/protobuf/message_unittest.inc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/google/protobuf/message_unittest.inc b/src/google/protobuf/message_unittest.inc
index b518c0bb40..832e3feddb 100644
--- a/src/google/protobuf/message_unittest.inc
+++ b/src/google/protobuf/message_unittest.inc
@@ -420,6 +420,12 @@ TEST(MESSAGE_TEST_NAME, UnparsedEmpty) {
   EXPECT_EQ(message.lazy_child().ByteSizeLong(), 0);
 }
 
+TEST(MESSAGE_TEST_NAME, DefaultInstanceByteSizeLong) {
+  EXPECT_EQ(UNITTEST::NestedTestAllTypes::default_instance().ByteSizeLong(), 0);
+  EXPECT_EQ(UNITTEST::NestedTestAllTypes::default_instance().GetCachedSize(),
+            0);
+}
+
 TEST(MESSAGE_TEST_NAME, ParseFailNonCanonicalZeroTag) {
   const char encoded[] = {"\n\x3\x80\0\0"};
   UNITTEST::NestedTestAllTypes parsed;