[common] Minor fixes to the tearDown method

beat/web/common/testutils.py

@@ -43,7 +43,7 @@ class BaseTestCase(TestCase):
         model = None
 
 
-    def tearDown():
+    def tearDown(self):
 
         if os.path.exists(settings.CACHE_ROOT):
             shutil.rmtree(settings.CACHE_ROOT)