style: update test case for python

Author: yanglbme

src/python/test/test_social_relationship.py

@@ -4,10 +4,9 @@
 
 from main.social_relationship import SocialRelationship
 
-test_case = TestCase()
-
 
 def test_sns():
+    test_case = TestCase()
     redis = Redis(decode_responses=True)
     bingo = SocialRelationship(redis, 'Bingo')
     iris = SocialRelationship(redis, 'Iris')