From a3e7ac1fc68c6cca3d6d61a784c70cebf23e579d Mon Sep 17 00:00:00 2001
From: "claude[bot]" <209825114+claude[bot]@users.noreply.github.com>
Date: Thu, 10 Sep 2026 11:13:10 +0300
Subject: [PATCH] test(adoption): revision guard witness for optimistic
 rollback (#500 AC6)

Issue: #500
User-Visible: no
---
 test/config-adoption.test.mjs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/test/config-adoption.test.mjs b/test/config-adoption.test.mjs
index b871599f..97a3250c 100644
--- a/test/config-adoption.test.mjs
+++ b/test/config-adoption.test.mjs
@@ -380,6 +380,19 @@ test('AC6: a conflict reload or a newer mutation wins over a rejected candidate
   assert.equal(same.config.spaces[0].title, 'Newer local edit');
 });
 
+test('AC6: an attempt from an older revision cannot roll back the same content accepted at a newer one (#442 AC2)', () => {
+  const adoption = adoptedWith(cfg('Server before'), 3);
+  const attempted = cfg('Draft');
+  const attempt = adoption.beginOptimistic(adoption.config, attempted);
+  adoption.stageLocalConfig(attempted);
+  // the queued write for the very same body was accepted meanwhile
+  adoption.acceptConfigWrite(attempted, { rev: 4 });
+  assert.equal(contentFingerprint(adoption.config), attempt.attemptedFingerprint, 'content is identical — only the revision differs');
+  assert.equal(adoption.rollbackOptimistic(attempt), false, 'the revision guard alone must refuse');
+  assert.equal(adoption.config, attempted);
+  assert.equal(adoption.configRev, 4);
+});
+
 test('AC6: newer in-place content on the attempted root also wins (#442)', () => {
   const adoption = adoptedWith(cfg('Server before'), 3);
   const attempted = cfg('Draft');