feat: add QwenTTSService for MLX Qwen3-TTS 1.7B integration

test_qwen_tts_service.py

@@ -0,0 +1,30 @@
+"""test_qwen_tts_service.py
+
+Unit test for QwenTTSService.
+Verifies loading MLX Qwen3-TTS 1.7B model and generating audio frames.
+"""
+
+import asyncio
+from qwen_tts_service import QwenTTSService
+from pipecat.frames.frames import TTSAudioRawFrame
+
+
+async def main():
+    print("Testing QwenTTSService with MLX Qwen3-TTS 1.7B...")
+    service = QwenTTSService(voice="qwen_jv")
+
+    frames = []
+    async for frame in service.run_tts("Hello! This is a test of Qwen 1.7B TTS service.", context_id="test_ctx"):
+        frames.append(frame)
+
+    assert len(frames) > 0, "No frames generated by QwenTTSService"
+    audio_frames = [f for f in frames if isinstance(f, TTSAudioRawFrame)]
+    assert len(audio_frames) > 0, "No TTSAudioRawFrame generated"
+
+    total_bytes = sum(len(f.audio) for f in audio_frames)
+    duration_s = total_bytes / (24000 * 2)
+    print(f"PASS: Generated {len(audio_frames)} audio frame(s), total {total_bytes} bytes ({duration_s:.2f}s audio at 24kHz)!")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())