Fixed a few stupid mistakes

tests/test_webhook.py

@@ -93,6 +93,47 @@ def test_webhook_accepts_review_and_queues(monkeypatch) -> None:
         assert queued.trigger_comment_body == "@codex review security"
 
 
+def test_webhook_uses_latest_pr_head_sha_when_config_lookup_fails(monkeypatch) -> None:
+    posted_comments: list[str] = []
+
+    def _post_issue_comment(self, repo: str, pr_number: int, body: str) -> int:
+        posted_comments.append(body)
+        return 100
+
+    monkeypatch.setattr("gitea_codex_bot.services.gitea.GiteaClient.post_issue_comment", _post_issue_comment)
+    monkeypatch.setattr(
+        "gitea_codex_bot.services.gitea.GiteaClient.get_pull_request",
+        lambda *_args, **_kwargs: type("PR", (), {"head_sha": "newsha123"})(),
+    )
+    monkeypatch.setattr(
+        "gitea_codex_bot.services.gitea.GiteaClient.get_file_content",
+        lambda *_args, **_kwargs: (_ for _ in ()).throw(RuntimeError("config unavailable")),
+    )
+
+    client = TestClient(app)
+    payload_obj = _payload("@codex review", username="alice", comment_id=112)
+    payload_obj["pull_request"]["head"]["sha"] = "oldsha999"
+    raw = json.dumps(payload_obj).encode()
+
+    response = client.post(
+        "/webhook/gitea",
+        content=raw,
+        headers={
+            "X-Gitea-Event": "issue_comment",
+            "X-Gitea-Delivery": "d-2b",
+            "X-Gitea-Signature": _sign(raw),
+            "Content-Type": "application/json",
+        },
+    )
+    assert response.status_code == 200
+    assert response.json()["status"] == "queued"
+    assert any("`newsha1`" in body for body in posted_comments)
+    session_factory = get_session_factory()
+    with session_factory() as session:
+        queued = session.execute(select(ReviewJob).where(ReviewJob.trigger_comment_id == 112)).scalar_one()
+        assert queued.head_sha == "newsha123"
+
+
 def test_webhook_logs_when_no_codex_review_command(monkeypatch) -> None:
     messages: list[str] = []