From e0c27174b344aed3df58ab94deb128b65c0392bc Mon Sep 17 00:00:00 2001
From: ai-ag2026 <261867348+ai-ag2026@users.noreply.github.com>
Date: Thu, 28 May 2026 20:30:33 +0200
Subject: [PATCH] test: cover code-only title language fallback

---
 tests/test_title_aux_routing.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tests/test_title_aux_routing.py b/tests/test_title_aux_routing.py
index d1007924..816314f5 100644
--- a/tests/test_title_aux_routing.py
+++ b/tests/test_title_aux_routing.py
@@ -305,6 +305,16 @@ class TestGenerateTitleRawViaAuxTimeout(unittest.TestCase):
         self.assertNotEqual(title, 'Session Bilder')
         self.assertIn('Warum', title)
 
+    def test_code_only_first_message_does_not_trigger_german_language_guard(self):
+        """Code-only starts should fall through to the neutral/default title path."""
+        from api.streaming import _detect_title_language, _title_language_mismatch, _title_prompt_language_rule
+
+        code_only = "print('hello')\nfor i in range(3):\n    print(i)"
+
+        self.assertEqual(_detect_title_language(code_only), '')
+        self.assertEqual(_title_prompt_language_rule(code_only), 'Match the language of the user question.\n')
+        self.assertFalse(_title_language_mismatch(code_only, 'Python Hello Loop'))
+
     def test_configured_api_key_is_not_sent_to_caller_supplied_route(self):
         """Regression: title task keys must not leak to explicit fallback routes.