diff --git a/tests/unit/test_mock_asr_service.py b/tests/unit/test_mock_asr_service.py
index 6491c310d..2c85c6844 100755
--- a/tests/unit/test_mock_asr_service.py
+++ b/tests/unit/test_mock_asr_service.py
@@ -1,4 +1,5 @@
 """MockASRService 单测 — Mock ASR服务纯逻辑部分."""
+
 from __future__ import annotations
 
 from pathlib import Path
@@ -8,7 +9,6 @@ import pytest
 from packages.adapters.asr.mock_asr_service import MockASRService
 from packages.ports.asr_service import ASRServiceError
 
-
 # ── Fixtures ────────────────────────────────────────────────────────────────
 
 
diff --git a/tests/unit/test_mock_tts_service.py b/tests/unit/test_mock_tts_service.py
index 59c9cfd9f..e3845bcba 100755
--- a/tests/unit/test_mock_tts_service.py
+++ b/tests/unit/test_mock_tts_service.py
@@ -1,10 +1,10 @@
 """MockTtsService 单测 — Mock TTS服务纯逻辑部分."""
+
 from __future__ import annotations
 
 import pytest
 
-from packages.adapters.tts.mock_tts_service import MockTtsService, _CHARS_PER_SECOND
-
+from packages.adapters.tts.mock_tts_service import _CHARS_PER_SECOND, MockTtsService
 
 # ── Fixtures ────────────────────────────────────────────────────────────────
 
diff --git a/tests/unit/test_tts_service_factory.py b/tests/unit/test_tts_service_factory.py
index 22f29f0cd..a1c319c09 100755
--- a/tests/unit/test_tts_service_factory.py
+++ b/tests/unit/test_tts_service_factory.py
@@ -1,4 +1,5 @@
 """TTS Service Factory 单测 — TTS服务工厂."""
+
 from __future__ import annotations
 
 import os
@@ -14,7 +15,6 @@ from services.tts_service_factory import (
     register_provider,
 )
 
-
 # ── Fixtures ────────────────────────────────────────────────────────────────