diff --git a/src/objecttypes/tests/v1/test_auth.py b/src/objecttypes/tests/v1/test_auth.py
index 47aac43a..0f7ef698 100644
--- a/src/objecttypes/tests/v1/test_auth.py
+++ b/src/objecttypes/tests/v1/test_auth.py
@@ -25,7 +25,7 @@ def test_invalid_token(self):
         TokenAuth.objects.create(contact_person="John Smith", email="smith@bomen.nl")
         for url in self.urls:
             with self.subTest(url=url):
-                response = self.client.get(url, HTTP_AUTHORIZATION=f"Token 12345")
+                response = self.client.get(url, HTTP_AUTHORIZATION="Token 12345")
                 self.assertEqual(response.status_code, status.HTTP_401_UNAUTHORIZED)
 
     def test_valid_token(self):
diff --git a/src/objecttypes/tests/v1/test_filters.py b/src/objecttypes/tests/v1/test_filters.py
index 5bf13191..1c1b2728 100644
--- a/src/objecttypes/tests/v1/test_filters.py
+++ b/src/objecttypes/tests/v1/test_filters.py
@@ -15,9 +15,7 @@ def test_filter_public_data(self):
         object_type_1 = ObjectTypeFactory.create(
             data_classification=DataClassificationChoices.open
         )
-        object_type_2 = ObjectTypeFactory.create(
-            data_classification=DataClassificationChoices.intern
-        )
+        ObjectTypeFactory.create(data_classification=DataClassificationChoices.intern)
 
         response = self.client.get(
             self.url, {"dataClassification": DataClassificationChoices.open}
diff --git a/src/objecttypes/tests/v1/test_objecttype_api.py b/src/objecttypes/tests/v1/test_objecttype_api.py
index de47842a..e6c6e512 100644
--- a/src/objecttypes/tests/v1/test_objecttype_api.py
+++ b/src/objecttypes/tests/v1/test_objecttype_api.py
@@ -21,6 +21,10 @@ def test_get_objecttypes(self):
 
         response = self.client.get(url)
 
+        version_path = reverse(
+            "objectversion-detail", args=[object_type.uuid, object_version.version]
+        )
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(
             response.json(),
@@ -43,9 +47,7 @@ def test_get_objecttypes(self):
                 "createdAt": "2020-01-01",
                 "modifiedAt": "2020-01-01",
                 "allowGeometry": object_type.allow_geometry,
-                "versions": [
-                    f"http://testserver{reverse('objectversion-detail', args=[object_type.uuid, object_version.version])}"
-                ],
+                "versions": [f"http://testserver{version_path}"],
             },
         )
 
@@ -63,13 +65,16 @@ def test_get_objecttypes_with_versions(self):
 
                 self.assertEqual(response.status_code, status.HTTP_200_OK)
 
+                version_path = reverse(
+                    "objectversion-detail",
+                    args=[object_type.uuid, object_versions[i].version],
+                )
+
                 data = response.json()
                 self.assertEqual(len(data["versions"]), 1)
                 self.assertEqual(
                     data["versions"],
-                    [
-                        f"http://testserver{reverse('objectversion-detail', args=[object_type.uuid, object_versions[i].version])}"
-                    ],
+                    [f"http://testserver{version_path}"],
                 )
 
     def test_create_objecttype(self):
diff --git a/src/objecttypes/tests/v1/test_objectversion_api.py b/src/objecttypes/tests/v1/test_objectversion_api.py
index c729d791..3c46fcdc 100644
--- a/src/objecttypes/tests/v1/test_objectversion_api.py
+++ b/src/objecttypes/tests/v1/test_objectversion_api.py
@@ -29,14 +29,22 @@ def test_get_versions(self):
 
         response = self.client.get(url)
 
+        object_path = reverse(
+            "objectversion-detail", args=[object_type.uuid, object_version.version]
+        )
+
+        objecttype_path = reverse(
+            "objecttype-detail", args=[object_version.object_type.uuid]
+        )
+
         self.assertEqual(response.status_code, status.HTTP_200_OK)
         self.assertEqual(
             response.json(),
             [
                 {
-                    "url": f"http://testserver{reverse('objectversion-detail', args=[object_type.uuid, object_version.version])}",
+                    "url": f"http://testserver{object_path}",
                     "version": object_version.version,
-                    "objectType": f"http://testserver{reverse('objecttype-detail', args=[object_version.object_type.uuid])}",
+                    "objectType": f"http://testserver{objecttype_path}",
                     "status": object_version.status,
                     "createdAt": "2020-01-01",
                     "modifiedAt": "2020-01-01",