test: cover API auth error handling

Author: Diyoncrz18

tests/test_transcriber_models.py

@@ -0,0 +1,49 @@
+import io
+import sys
+import types
+import unittest
+from contextlib import redirect_stdout
+
+sys.modules.setdefault(
+    "ctranslate2",
+    types.SimpleNamespace(get_cuda_device_count=lambda: 0),
+)
+sys.modules.setdefault(
+    "faster_whisper",
+    types.SimpleNamespace(WhisperModel=object),
+)
+sys.modules.setdefault(
+    "openai",
+    types.SimpleNamespace(OpenAI=object),
+)
+
+from TranscriberModels import APIWhisperTranscriber
+
+
+class FakeAuthError(Exception):
+    status_code = 401
+    code = "expired_api_key"
+
+
+class APIWhisperTranscriberTests(unittest.TestCase):
+    def test_auth_error_detection_handles_expired_key_response(self):
+        error = FakeAuthError("Invalid API Key: expired_api_key")
+
+        self.assertTrue(APIWhisperTranscriber._is_auth_error(error))
+
+    def test_auth_error_disables_api_and_logs_once(self):
+        transcriber = APIWhisperTranscriber.__new__(APIWhisperTranscriber)
+        transcriber.api_available = True
+        transcriber.auth_error_logged = False
+
+        output = io.StringIO()
+        with redirect_stdout(output):
+            transcriber._disable_api_after_auth_error(FakeAuthError("expired_api_key"))
+            transcriber._disable_api_after_auth_error(FakeAuthError("expired_api_key"))
+
+        self.assertFalse(transcriber.api_available)
+        self.assertEqual(output.getvalue().count("API key rejected by provider"), 1)
+
+
+if __name__ == "__main__":
+    unittest.main()