Fix typo and unused imports (#1196)

* fix file exists of sub folder

* fix code doc

* add ci

* lint code

* fix unused imports and typo

tests/hub/test_file_exists.py

@@ -1,24 +1,8 @@
 # Copyright (c) Alibaba, Inc. and its affiliates.
-import os
-import shutil
-import tempfile
 import unittest
-import uuid
-from os.path import expanduser
-
-from requests import delete
 
 from modelscope.hub.api import HubApi
-from modelscope.hub.constants import Licenses, ModelVisibility
-from modelscope.hub.errors import NotExistError
-from modelscope.hub.file_download import model_file_download
-from modelscope.hub.git import GitCommandWrapper
-from modelscope.hub.repository import Repository
-from modelscope.utils.constant import ModelFile
 from modelscope.utils.logger import get_logger
-from modelscope.utils.test_utils import (TEST_ACCESS_TOKEN1,
-                                         TEST_MODEL_CHINESE_NAME,
-                                         TEST_MODEL_ORG, delete_credential)
 
 logger = get_logger()
 logger.setLevel('DEBUG')
@@ -28,7 +12,7 @@ download_model_file_name = 'test.bin'
 
 class FileExistsTest(unittest.TestCase):
 
-    def test_file_exsists(self):
+    def test_file_exists(self):
         api = HubApi()
         self.assertTrue(
             api.file_exists('iic/gte_Qwen2-7B-instruct', 'added_tokens.json'))