[codex] Isolate translation langdetect imports on Windows

backend/tests/unit/test_translation_cost_optimization.py

@@ -11,14 +11,76 @@
 
 import asyncio
 import hashlib
+import importlib.util
 import os
 import sys
 import time
 from collections import OrderedDict
+from types import ModuleType
 from unittest.mock import MagicMock, patch, AsyncMock
 
 import pytest
 
+_BACKEND_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
+
+
+def _restore_package_path(name: str, path: str):
+    module = sys.modules.get(name)
+    if module is not None:
+        module.__path__ = [path]
+
+
+class _DetectedLang:
+    def __init__(self, lang: str, prob: float):
+        self.lang = lang
+        self.prob = prob
+
+
+def _guess_language(text: str) -> str:
+    lower = (text or '').lower()
+    if any(marker in lower for marker in ('bonjour', 'merci', 'revoir', 'allez', 'suis', 'content')):
+        return 'fr'
+    if any(marker in lower for marker in ('hola', 'gracias', 'adios', 'adi贸s')):
+        return 'es'
+    if 'danke' in lower:
+        return 'de'
+    return 'en'
+
+
+def _install_langdetect_stub_if_missing():
+    if 'langdetect' not in sys.modules and importlib.util.find_spec('langdetect') is not None:
+        return
+
+    langdetect_mod = sys.modules.get('langdetect') or ModuleType('langdetect')
+    exception_mod = sys.modules.get('langdetect.lang_detect_exception') or ModuleType(
+        'langdetect.lang_detect_exception'
+    )
+
+    class LangDetectException(Exception):
+        pass
+
+    class DetectorFactory:
+        seed = None
+
+    def detect(text):
+        return _guess_language(text)
+
+    def detect_langs(text):
+        return [_DetectedLang(_guess_language(text), 0.99)]
+
+    exception_mod.LangDetectException = LangDetectException
+    langdetect_mod.detect = detect
+    langdetect_mod.detect_langs = detect_langs
+    langdetect_mod.DetectorFactory = DetectorFactory
+    langdetect_mod.lang_detect_exception = exception_mod
+    sys.modules['langdetect'] = langdetect_mod
+    sys.modules['langdetect.lang_detect_exception'] = exception_mod
+
+
+_restore_package_path('utils', os.path.join(_BACKEND_DIR, 'utils'))
+_restore_package_path('models', os.path.join(_BACKEND_DIR, 'models'))
+_install_langdetect_stub_if_missing()
+
 # --- Module-level mocks for heavy dependencies (must happen before any project imports) ---
 _mock_redis = MagicMock()
 _mock_redis.get.return_value = None

backend/tests/unit/test_translation_optimization.py

@@ -13,6 +13,8 @@
 import sys
 import json
 import hashlib
+import importlib.util
+from types import ModuleType
 from unittest.mock import MagicMock, patch, PropertyMock
 
 os.environ.setdefault(
@@ -63,6 +65,67 @@ def _ensure_mock_module(name: str):
     return sys.modules[name]
 
 
+_BACKEND_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..'))
+
+
+def _restore_package_path(name: str, path: str):
+    module = sys.modules.get(name)
+    if module is not None:
+        module.__path__ = [path]
+
+
+class _DetectedLang:
+    def __init__(self, lang: str, prob: float):
+        self.lang = lang
+        self.prob = prob
+
+
+def _guess_language(text: str) -> str:
+    lower = (text or '').lower()
+    if any(marker in lower for marker in ('bonjour', 'merci', 'revoir', 'allez', 'suis', 'content')):
+        return 'fr'
+    if any(marker in lower for marker in ('hola', 'gracias', 'adios', 'adi贸s')):
+        return 'es'
+    if 'danke' in lower:
+        return 'de'
+    return 'en'
+
+
+def _install_langdetect_stub_if_missing():
+    if 'langdetect' not in sys.modules and importlib.util.find_spec('langdetect') is not None:
+        return
+
+    langdetect_mod = sys.modules.get('langdetect') or ModuleType('langdetect')
+    exception_mod = sys.modules.get('langdetect.lang_detect_exception') or ModuleType(
+        'langdetect.lang_detect_exception'
+    )
+
+    class LangDetectException(Exception):
+        pass
+
+    class DetectorFactory:
+        seed = None
+
+    def detect(text):
+        return _guess_language(text)
+
+    def detect_langs(text):
+        return [_DetectedLang(_guess_language(text), 0.99)]
+
+    exception_mod.LangDetectException = LangDetectException
+    langdetect_mod.detect = detect
+    langdetect_mod.detect_langs = detect_langs
+    langdetect_mod.DetectorFactory = DetectorFactory
+    langdetect_mod.lang_detect_exception = exception_mod
+    sys.modules['langdetect'] = langdetect_mod
+    sys.modules['langdetect.lang_detect_exception'] = exception_mod
+
+
+_restore_package_path('utils', os.path.join(_BACKEND_DIR, 'utils'))
+_restore_package_path('models', os.path.join(_BACKEND_DIR, 'models'))
+_install_langdetect_stub_if_missing()
+
+
 # Stub database module and redis
 _ensure_mock_module("database")
 sys.modules["database"].__path__ = getattr(sys.modules["database"], '__path__', [])