release(main): 同步台账恢复与字体合规调整

backend/tests/test_ledgers.py

@@ -86,6 +86,41 @@ async def test_initialization_preserves_both_uploaded_templates_and_is_idempoten
         assert "ledgers" in Path(revision.file_uri).parts
 
 
+@pytest.mark.asyncio
+async def test_failed_ledger_session_recovers_server_backup_under_a_new_document_key(env, monkeypatch):
+    item = await env.db.get(CollaborationFile, env.initial[0].id)
+    first = await office.build_editor_config(env.db, item, env.admin)
+    failed = await env.db.scalar(select(CollaborationSession).where(
+        CollaborationSession.file_id == item.id,
+        CollaborationSession.generation == item.generation,
+    ))
+    failed.status = "ERROR"
+    await env.db.commit()
+
+    current = await env.db.get(CollaborationRevision, item.current_revision_id)
+    recovered_buffer = io.BytesIO(Path(current.file_uri).read_bytes())
+    with zipfile.ZipFile(recovered_buffer, "a") as package:
+        package.comment = b"document-server-recovery"
+    recovery = AsyncMock(return_value=recovered_buffer.getvalue())
+    monkeypatch.setattr(office, "_recover_forgotten_content", recovery)
+
+    reopened = await office.build_editor_config(env.db, item, env.admin)
+    await env.db.refresh(item)
+    await env.db.refresh(failed)
+    sessions = (await env.db.scalars(select(CollaborationSession).where(
+        CollaborationSession.file_id == item.id,
+    ).order_by(CollaborationSession.generation))).all()
+    recovered_revision = await env.db.get(CollaborationRevision, item.current_revision_id)
+
+    assert first.config["document"]["key"] != reopened.config["document"]["key"]
+    assert item.generation == 2
+    assert failed.status == "RECOVERED"
+    assert [session.generation for session in sessions] == [1, 2]
+    assert recovered_revision.source == "SERVER_RECOVERY"
+    assert recovered_revision.change_summary == "自动恢复在线文档服务器备份"
+    recovery.assert_awaited_once_with(failed.document_key, "cell")
+
+
 @pytest.mark.asyncio
 async def test_account_grants_are_independent_and_all_file_routes_require_access(env):
     await grant(env, env.editor, "EDITOR")