diff --git a/tests/test_forms.py b/tests/test_forms.py
index 90ecab7a..64ff01c0 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -426,6 +426,7 @@ class TestModel(db.Document):
 def test_modelselectfield_multiple_selected_elements_must_be_retained(app, db):
     with app.test_request_context("/"):
 
+
         class Dog(db.Document):
             name = db.StringField()
 
@@ -448,7 +449,7 @@ class DogOwner(db.Document):
 
         # Should have one selected option
         assert m is not None
-        assert "fido" == m.group(1)
+        assert "fido" == m[1]
 
 
 def test_model_form_help_text(app, db):
@@ -497,6 +498,7 @@ class BlogPost(db.Document):
 def test_embedded_model_form(app, db):
     with app.test_request_context("/"):
 
+
         class Content(db.EmbeddedDocument):
             text = db.StringField()
             lang = db.StringField(max_length=3)
@@ -508,21 +510,25 @@ class Post(db.Document):
 
         PostForm = model_form(Post)
         form = PostForm()
-        assert "content-text" in "%s" % form.content.text
+        assert "content-text" in f"{form.content.text}"
 
 
 def test_form_label_modifier(app, db):
     with app.test_request_context("/"):
 
+
         class FoodItem(db.Document):
             title = db.StringField()
 
+
+
         class FoodStore(db.Document):
             title = db.StringField(max_length=120, required=True)
             food_items = db.ListField(field=db.ReferenceField(document_type=FoodItem))
 
-            def food_items_label_modifier(obj):
-                return obj.title
+            def food_items_label_modifier(self):
+                return self.title
+
 
         fruit_names = ["banana", "apple", "pear"]