diff --git a/tests/test_viewset_mixin.py b/tests/test_viewset_mixin.py
index 3b1d3ff..7799258 100644
--- a/tests/test_viewset_mixin.py
+++ b/tests/test_viewset_mixin.py
@@ -4,7 +4,7 @@
 from rest_framework.test import APIClient
 from time_machine import TimeMachineFixture
 
-from tests.testapp.models import ExampleModel, AllFieldsModel, Tag, SecretFieldModel
+from tests.testapp.models import AllFieldsModel, ExampleModel, SecretFieldModel, Tag
 
 pytestmark = pytest.mark.django_db
 
diff --git a/tests/testapp/serializers.py b/tests/testapp/serializers.py
index b6cab19..e433822 100644
--- a/tests/testapp/serializers.py
+++ b/tests/testapp/serializers.py
@@ -1,6 +1,6 @@
 from rest_framework import serializers
 
-from .models import ExampleModel, AllFieldsModel, SecretFieldModel
+from .models import AllFieldsModel, ExampleModel, SecretFieldModel
 
 
 class ExampleSerializer(serializers.ModelSerializer):
@@ -24,6 +24,7 @@ class Meta:
             "tags",
         )
 
+
 class SecretFieldSerializer(serializers.ModelSerializer):
     secret_external = serializers.CharField(write_only=True)
 
@@ -31,6 +32,4 @@ class Meta:
         model = SecretFieldModel
         fields = ("title", "secret", "secret_external")
 
-        extra_kwargs = {
-            "secret": {"write_only": True}
-        }
+        extra_kwargs = {"secret": {"write_only": True}}
diff --git a/tests/testapp/views.py b/tests/testapp/views.py
index 06b0354..71b7038 100644
--- a/tests/testapp/views.py
+++ b/tests/testapp/views.py
@@ -3,8 +3,8 @@
 from drf_excel.mixins import XLSXFileMixin
 from drf_excel.renderers import XLSXRenderer
 
-from .models import ExampleModel, AllFieldsModel, SecretFieldModel
-from .serializers import ExampleSerializer, AllFieldsSerializer, SecretFieldSerializer
+from .models import AllFieldsModel, ExampleModel, SecretFieldModel
+from .serializers import AllFieldsSerializer, ExampleSerializer, SecretFieldSerializer
 
 
 class ExampleViewSet(XLSXFileMixin, ReadOnlyModelViewSet):
diff --git a/tests/urls.py b/tests/urls.py
index b4ed812..d875c66 100644
--- a/tests/urls.py
+++ b/tests/urls.py
@@ -1,6 +1,6 @@
 from rest_framework import routers
 
-from .testapp.views import ExampleViewSet, AllFieldsViewSet, SecretFieldViewSet
+from .testapp.views import AllFieldsViewSet, ExampleViewSet, SecretFieldViewSet
 
 router = routers.SimpleRouter()
 router.register(r"examples", ExampleViewSet)