Extend lint test to test/ directory (#13247)

test/srt/ep/test_deepep_intranode.py

@@ -1,6 +1,5 @@
 # Copy from deepseek-ai/DeepEP/tests/test_intranode.py
 
-import os
 import time
 
 # noinspection PyUnresolvedReferences

test/srt/ep/test_deepep_small.py

@@ -317,7 +317,6 @@ class TestMTP(CustomTestCase):
 class TestMTPWithTBO(CustomTestCase):
     @classmethod
     def setUpClass(cls):
-        import os
 
         cls.model = DEFAULT_MODEL_NAME_FOR_TEST_MLA
         cls.base_url = DEFAULT_URL_FOR_TEST

test/srt/ep/test_eplb.py

@@ -1,4 +1,3 @@
-import os
 import tempfile
 import unittest
 from pathlib import Path

test/srt/ep/test_moe_deepep.py

@@ -1,5 +1,4 @@
 import json
-import os
 import unittest
 from types import SimpleNamespace