Remove Beta 1 and Piper fallback

platform/docker/tts-gateway/test_tts_gateway.py

@@ -244,25 +244,20 @@ class LanguageSegmentationTests(unittest.TestCase):
         self.assertTrue(all(len(part.split()) > 4 for _, part in segments))
 
 
-class FallbackTests(unittest.TestCase):
+class BackendFailureTests(unittest.TestCase):
     def setUp(self):
-        self.original_xtts = gateway.synthesize_xtts
-        self.original_piper = gateway.synthesize_piper
+        self.original_qwen = gateway.synthesize_qwen
 
     def tearDown(self):
-        gateway.synthesize_xtts = self.original_xtts
-        gateway.synthesize_piper = self.original_piper
+        gateway.synthesize_qwen = self.original_qwen
 
-    def test_piper_is_used_when_xtts_fails(self):
+    def test_qwen_failure_is_reported_without_fallback(self):
         def fail(*_args):
-            raise RuntimeError("synthetic XTTS failure")
+            raise RuntimeError("synthetic Qwen failure")
 
-        gateway.synthesize_xtts = fail
-        gateway.synthesize_piper = lambda *_args: (b"piper", "audio/wav")
-        self.assertEqual(
-            gateway.synthesize("synthetic test", "wav", 1.0),
-            (b"piper", "audio/wav"),
-        )
+        gateway.synthesize_qwen = fail
+        with self.assertRaisesRegex(RuntimeError, "synthetic Qwen failure"):
+            gateway.synthesize("synthetic test", "wav", 1.0)
 
 
 class AudioJoinTests(unittest.TestCase):