fix(blog): acquitter les GUID apres livraison XMPP

tests/unit/test_blog_state.py

@@ -14,11 +14,14 @@ Tous les tests utilisent des fichiers temporaires via la fixture ``tmp_path``.
 from __future__ import annotations
 
 import json
+from datetime import UTC, datetime
 from pathlib import Path
 from unittest.mock import patch
 
 import pytest
 
+from pronote_sync.models.blog import BlogArticle
+from pronote_sync.sources.blog.result import BlogRSSFetchResult
 from pronote_sync.sources.blog.state import BlogRSSState
 
 
@@ -116,6 +119,38 @@ def test_add_guids_empty_noop(tmp_path: Path) -> None:
     assert state_file.read_text(encoding="utf-8") == original_content
 
 
+def test_acknowledge_persists_guids_and_cache_headers_together(tmp_path: Path) -> None:
+    """Vérifie l'acquittement atomique après une livraison confirmée.
+
+    :param tmp_path: Fixture pytest pour un répertoire temporaire.
+    :return: None
+    """
+    state_file = tmp_path / "state.json"
+    state = BlogRSSState(state_file)
+    article = BlogArticle(
+        id="guid-1",
+        title="Article",
+        url="https://example.com/article",
+        published_at=datetime(2026, 9, 12, 8, 0, tzinfo=UTC),
+        updated_at=None,
+        category=None,
+        author=None,
+        content_html="<p>Contenu</p>",
+        content_text="Contenu",
+    )
+
+    state.acknowledge(
+        BlogRSSFetchResult(
+            articles=(article,),
+            etag="etag-1",
+            last_modified="Sat, 12 Sep 2026 08:00:00 GMT",
+        )
+    )
+
+    assert state.get_known_guids() == frozenset({"guid-1"})
+    assert state.get_cache_headers() == ("etag-1", "Sat, 12 Sep 2026 08:00:00 GMT")
+
+
 def test_state_load_persisted_guids(tmp_path: Path) -> None:
     """Vérifie que les GUID persistés sont rechargés dans une nouvelle instance.