diff --git a/authority/tests.py b/authority/tests.py
index 45350a6..84b27fc 100644
--- a/authority/tests.py
+++ b/authority/tests.py
@@ -7,11 +7,13 @@ from authority import permissions
 from authority.models import Permission
 from authority.exceptions import NotAModel, UnsavedModelInstance
 
+
 class UserPermission(permissions.BasePermission):
     checks = ('browse',)
     label = 'user_permission'
 authority.register(User, UserPermission)
 
+
 class BehaviourTest(TestCase):
     """
     self.user will be given:
@@ -21,7 +23,7 @@ class BehaviourTest(TestCase):
     This permissions are given in the test case and not in the fixture, for
     later reference.
     """
-    fixtures = ['tests.json',]
+    fixtures = ['tests.json']
 
     def setUp(self):
         self.user = User.objects.get(username='jezdez')
@@ -53,39 +55,44 @@ class BehaviourTest(TestCase):
         self.assertFalse(self.check.delete_user())
         self.assertTrue(self.check.delete_user(self.user))
 
+
 class AssignBehaviourTest(TestCase):
-   """
-   self.user will be given:
-   - permission add_user (test_add),
-   - permission delete_user for him (test_delete),
-   - all existing codenames permissions: a/b/c/d (test_all),
-   """
-   fixtures = ['tests.json',]
+    """
+    self.user will be given:
+    - permission add_user (test_add),
+    - permission delete_user for him (test_delete),
+    - all existing codenames permissions: a/b/c/d (test_all),
+    """
+    fixtures = ['tests.json']
 
-   def setUp(self):
-       self.user = User.objects.get(username='jezdez')
-       self.check = UserPermission(self.user)
+    def setUp(self):
+        self.user = User.objects.get(username='jezdez')
+        self.check = UserPermission(self.user)
 
-   def test_add(self):
-       result = self.check.assign(check='add_user')
+    def test_add(self):
+        result = self.check.assign(check='add_user')
 
-       self.assertTrue(isinstance(result[0], DjangoPermission))
-       self.assertTrue(self.check.add_user())
+        self.assertTrue(isinstance(result[0], DjangoPermission))
+        self.assertTrue(self.check.add_user())
 
-   def test_delete(self):
-       result = self.check.assign(content_object=self.user, check='delete_user')
+    def test_delete(self):
+        result = self.check.assign(
+            content_object=self.user,
+            check='delete_user',
+        )
 
-       self.assertTrue(isinstance(result[0], Permission))
-       self.assertFalse(self.check.delete_user())
-       self.assertTrue(self.check.delete_user(self.user))
+        self.assertTrue(isinstance(result[0], Permission))
+        self.assertFalse(self.check.delete_user())
+        self.assertTrue(self.check.delete_user(self.user))
+
+    def test_all(self):
+        result = self.check.assign(content_object=self.user)
+        self.assertTrue(isinstance(result, list))
+        self.assertTrue(self.check.browse_user(self.user))
+        self.assertTrue(self.check.delete_user(self.user))
+        self.assertTrue(self.check.add_user(self.user))
+        self.assertTrue(self.check.change_user(self.user))
 
-   def test_all(self):
-       result = self.check.assign(content_object=self.user)
-       self.assertTrue(isinstance(result, list))
-       self.assertTrue(self.check.browse_user(self.user))
-       self.assertTrue(self.check.delete_user(self.user))
-       self.assertTrue(self.check.add_user(self.user))
-       self.assertTrue(self.check.change_user(self.user))
 
 class GenericAssignBehaviourTest(TestCase):
     """
@@ -93,7 +100,7 @@ class GenericAssignBehaviourTest(TestCase):
     - permission add (test_add),
     - permission delete for him (test_delete),
     """
-    fixtures = ['tests.json',]
+    fixtures = ['tests.json']
 
     def setUp(self):
         self.user = User.objects.get(username='jezdez')
@@ -106,17 +113,23 @@ class GenericAssignBehaviourTest(TestCase):
         self.assertTrue(self.check.add_user())
 
     def test_delete(self):
-        result = self.check.assign(content_object=self.user, check='delete', generic=True)
+        result = self.check.assign(
+            content_object=self.user,
+            check='delete',
+            generic=True,
+        )
 
         self.assertTrue(isinstance(result[0], Permission))
         self.assertFalse(self.check.delete_user())
         self.assertTrue(self.check.delete_user(self.user))
 
+
 class AssignExceptionsTest(TestCase):
     """
-    Tests that exceptions are thrown if assign() was called with inconsistent arguments.
+    Tests that exceptions are thrown if assign() was called with inconsistent
+    arguments.
     """
-    fixtures = ['tests.json',]
+    fixtures = ['tests.json']
 
     def setUp(self):
         self.user = User.objects.get(username='jezdez')