diff --git a/tests/celery_tests.py b/tests/celery_tests.py
index 0debe66c3e6d7..b2681f27a5567 100644
--- a/tests/celery_tests.py
+++ b/tests/celery_tests.py
@@ -14,7 +14,6 @@
 from past.builtins import basestring
 
 from superset import app, appbuilder, cli, dataframe, db
-from superset.models import core as models
 from superset.models.helpers import QueryStatus
 from superset.models.sql_lab import Query
 from superset.security import sync_role_definitions
diff --git a/tests/druid_tests.py b/tests/druid_tests.py
index 276a010822f32..7ac3829d11b5a 100644
--- a/tests/druid_tests.py
+++ b/tests/druid_tests.py
@@ -12,8 +12,7 @@
 
 from superset import db, security, sm
 from superset.connectors.druid.models import (
-    DruidCluster, DruidDatasource, DruidMetric, Postaggregator, PyDruid,
-    Quantile,
+    DruidCluster, DruidDatasource, DruidMetric,
 )
 from .base_tests import SupersetTestCase
 
@@ -75,7 +74,7 @@ class DruidTests(SupersetTestCase):
     def __init__(self, *args, **kwargs):
         super(DruidTests, self).__init__(*args, **kwargs)
 
-    @patch('superset.connectors.druid.models.PyDruid')  # noqa ignore: F811
+    @patch('superset.connectors.druid.models.PyDruid')
     def test_client(self, PyDruid):
         self.login(username='admin')
         instance = PyDruid.return_value
@@ -280,7 +279,7 @@ def test_filter_druid_datasource(self):
         self.assertIn('datasource_for_gamma', resp)
         self.assertNotIn('datasource_not_for_gamma', resp)
 
-    @patch('superset.connectors.druid.models.PyDruid')  # noqa ignore: F811
+    @patch('superset.connectors.druid.models.PyDruid')
     def test_sync_druid_perm(self, PyDruid):
         self.login(username='admin')
         instance = PyDruid.return_value
diff --git a/tests/superset_test_config.py b/tests/superset_test_config.py
index 6e6426dd4284c..d65c85ff917f1 100644
--- a/tests/superset_test_config.py
+++ b/tests/superset_test_config.py
@@ -1,3 +1,4 @@
+# flake8: noqa
 from superset.config import *
 
 AUTH_USER_REGISTRATION_ROLE = 'alpha'
diff --git a/tests/viz_tests.py b/tests/viz_tests.py
index 4b97027284f95..416cf3976c509 100644
--- a/tests/viz_tests.py
+++ b/tests/viz_tests.py
@@ -1,4 +1,4 @@
-from datetime import datetime, timedelta
+from datetime import datetime
 import unittest
 
 from mock import Mock, patch
@@ -8,6 +8,7 @@
 from superset.utils import DTTM_ALIAS
 import superset.viz as viz
 
+
 class BaseVizTestCase(unittest.TestCase):
     def test_constructor_exception_no_datasource(self):
         form_data = {}
diff --git a/tox.ini b/tox.ini
index a810a4a5c6eaa..66ddc8021caa6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -37,9 +37,6 @@ ignore =
     E703
     E731
     E741
-    F401
-    F403
-    F405
     Q000
     Q001
 import-order-style = google