diff --git a/setup.cfg b/setup.cfg
index c2f4c50..d385663 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,10 +3,11 @@ universal=1
 
 [isort]
 known_django = django
-sections = FUTURE,STDLIB,THIRDPARTY,DJANGO,FIRSTPARTY,LOCALFOLDER
+sections = FUTURE,STDLIB,THIRDPARTY,DJANGO,FIRSTPARTY,TESTS,LOCALFOLDER
 default_section = THIRDPARTY
 known_standard_library = requests
 known_first_party = django_hstore
+known_tests = django_hstore_tests
 multi_line_output = 3
 line_length = 100
 indent = 4
diff --git a/tests/django_hstore_tests/tests/test_dictionary_field.py b/tests/django_hstore_tests/tests/test_dictionary_field.py
index 8aca11e..b2a5dd2 100644
--- a/tests/django_hstore_tests/tests/test_dictionary_field.py
+++ b/tests/django_hstore_tests/tests/test_dictionary_field.py
@@ -1,33 +1,35 @@
 # -*- coding: utf-8 -*-
-import sys
+import datetime
 import json
 import pickle
+import sys
 from decimal import Decimal
-import datetime
 
 from django import VERSION as DJANGO_VERSION
 from django import forms
+from django.contrib.auth.models import User
+from django.core.exceptions import ValidationError
+from django.core.urlresolvers import reverse
 from django.db import transaction
 from django.db.models.aggregates import Count
 from django.db.utils import IntegrityError
-from django.core.exceptions import ValidationError
-from django.core.urlresolvers import reverse
-from django.contrib.auth.models import User
-from django.utils.encoding import force_text
 from django.test import TestCase
+from django.utils.encoding import force_text
 
 from django_hstore import get_version
-from django_hstore.forms import DictionaryFieldWidget
-from django_hstore.fields import HStoreDict
 from django_hstore.exceptions import HStoreDictException
+from django_hstore.fields import HStoreDict
+from django_hstore.forms import DictionaryFieldWidget
 from django_hstore.utils import get_cast_for_param
 
-from django_hstore_tests.models import (DataBag,
-                                        DefaultsModel,
-                                        NullableDataBag,
-                                        BadDefaultsModel,
-                                        UniqueTogetherDataBag,
-                                        NumberedDataBag)
+from django_hstore_tests.models import (
+    BadDefaultsModel,
+    DataBag,
+    DefaultsModel,
+    NullableDataBag,
+    NumberedDataBag,
+    UniqueTogetherDataBag
+)
 
 
 class TestDictionaryField(TestCase):
@@ -64,7 +66,7 @@ def test_decimal(self):
 
     def test_long(self):
         if sys.version < '3':
-            l = long(100000000000)
+            l = long(100000000000)  # noqa
             databag = DataBag(name='long')
             databag.data['long'] = l
             self.assertEqual(databag.data['long'], force_text(l))
@@ -172,7 +174,6 @@ def test_named_querying(self):
 
     def test_aggregates(self):
         self._create_bitfield_bags()
-
         self.assertEqual(DataBag.objects.filter(data__contains={'b0': '1'}).aggregate(Count('id'))['id__count'], 5)
         self.assertEqual(DataBag.objects.filter(data__contains={'b1': '1'}).aggregate(Count('id'))['id__count'], 4)
 
diff --git a/tests/django_hstore_tests/tests/test_not_transactional.py b/tests/django_hstore_tests/tests/test_not_transactional.py
index e76fd1e..9c25f5f 100644
--- a/tests/django_hstore_tests/tests/test_not_transactional.py
+++ b/tests/django_hstore_tests/tests/test_not_transactional.py
@@ -1,5 +1,5 @@
 from django import VERSION as DJANGO_VERSION
-from django.db import transaction, connection
+from django.db import connection, transaction
 from django.test import SimpleTestCase
 
 from django_hstore.fields import HStoreDict
diff --git a/tests/django_hstore_tests/tests/test_reference_field.py b/tests/django_hstore_tests/tests/test_reference_field.py
index f89123c..f245f90 100644
--- a/tests/django_hstore_tests/tests/test_reference_field.py
+++ b/tests/django_hstore_tests/tests/test_reference_field.py
@@ -1,12 +1,12 @@
-from django.core.urlresolvers import reverse
+from django import forms
 from django.contrib.auth.models import User
+from django.core.urlresolvers import reverse
 from django.test import TestCase
-from django import forms
 
 from django_hstore.forms import ReferencesFieldWidget
-from django_hstore.utils import unserialize_references, serialize_references, acquire_reference
+from django_hstore.utils import acquire_reference, serialize_references, unserialize_references
 
-from django_hstore_tests.models import Ref, RefsBag, NullableRefsBag
+from django_hstore_tests.models import NullableRefsBag, Ref, RefsBag
 
 
 class TestReferencesField(TestCase):
diff --git a/tests/django_hstore_tests/tests/test_schema_mode.py b/tests/django_hstore_tests/tests/test_schema_mode.py
index ccbad43..c1f172d 100644
--- a/tests/django_hstore_tests/tests/test_schema_mode.py
+++ b/tests/django_hstore_tests/tests/test_schema_mode.py
@@ -3,8 +3,6 @@
 import shutil
 import sys
 
-from django_hstore_tests.models import NullSchemaDataBag, SchemaDataBag
-
 import django
 from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
@@ -16,6 +14,8 @@
 from django_hstore import hstore
 from django_hstore.virtual import create_hstore_virtual_field
 
+from django_hstore_tests.models import NullSchemaDataBag, SchemaDataBag
+
 if sys.version_info[0] >= 3:
     from io import StringIO
 else:
diff --git a/tests/django_hstore_tests/tests/test_serialized_dictionary_field.py b/tests/django_hstore_tests/tests/test_serialized_dictionary_field.py
index f989651..3655e64 100644
--- a/tests/django_hstore_tests/tests/test_serialized_dictionary_field.py
+++ b/tests/django_hstore_tests/tests/test_serialized_dictionary_field.py
@@ -2,10 +2,10 @@
 import datetime
 
 from django import forms
-from django.db.models.aggregates import Count
+from django.contrib.auth.models import User
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
-from django.contrib.auth.models import User
+from django.db.models.aggregates import Count
 from django.test import TestCase
 
 from django_hstore.forms import SerializedDictionaryFieldWidget