diff --git a/backend/tests/test_simple_submissions/test_everything_not_ok.py b/backend/tests/test_simple_submissions/test_everything_not_ok.py
index 1736b29a..14833f8c 100644
--- a/backend/tests/test_simple_submissions/test_everything_not_ok.py
+++ b/backend/tests/test_simple_submissions/test_everything_not_ok.py
@@ -50,7 +50,7 @@ class FaultyProjectConstraintValidationTest(unittest.TestCase):
     submission_constraint = SubmissionConstraint(
         root_constraint=ZipConstraint(
             zip_name="project.zip",
-            global_constraints=[ExtensionNotPresentConstraint(extension=".exe")],
+            global_constraints=[ExtensionNotPresentConstraint(not_present_extension=".exe")],
             sub_constraints=[
                 DirectoryConstraint(
                     directory_name="src",
@@ -72,7 +72,7 @@ class FaultyProjectConstraintValidationTest(unittest.TestCase):
                 FileConstraint(file_name="README.md"),
                 FileConstraint(file_name=".gitignore"),
                 NotPresentConstraint(file_or_directory_name="dist"),
-                ExtensionNotPresentConstraint(extension=".log"),
+                ExtensionNotPresentConstraint(not_present_extension=".log"),
             ],
         ),
     )
diff --git a/backend/tests/test_simple_submissions/test_everything_ok.py b/backend/tests/test_simple_submissions/test_everything_ok.py
index 25dd3b27..7fafdb96 100644
--- a/backend/tests/test_simple_submissions/test_everything_ok.py
+++ b/backend/tests/test_simple_submissions/test_everything_ok.py
@@ -45,7 +45,7 @@ class EverythingOkTest(unittest.TestCase):
     submission_constraint = SubmissionConstraint(
         root_constraint=ZipConstraint(
             zip_name="project.zip",
-            global_constraints=[ExtensionNotPresentConstraint(extension=".exe")],
+            global_constraints=[ExtensionNotPresentConstraint(not_present_extension=".exe")],
             sub_constraints=[
                 DirectoryConstraint(
                     directory_name="src",
@@ -71,8 +71,8 @@ class EverythingOkTest(unittest.TestCase):
                 FileConstraint(file_name="README.md"),
                 FileConstraint(file_name=".gitignore"),
                 NotPresentConstraint(file_or_directory_name="dist"),
-                ExtensionNotPresentConstraint(extension=".class"),
-                ExtensionNotPresentConstraint(extension=".log"),
+                ExtensionNotPresentConstraint(not_present_extension=".class"),
+                ExtensionNotPresentConstraint(not_present_extension=".log"),
             ],
         ),
     )
diff --git a/backend/tests/test_simple_submissions/test_extension_not_present_constraint.py b/backend/tests/test_simple_submissions/test_extension_not_present_constraint.py
index c53c4912..7417fa7e 100644
--- a/backend/tests/test_simple_submissions/test_extension_not_present_constraint.py
+++ b/backend/tests/test_simple_submissions/test_extension_not_present_constraint.py
@@ -44,12 +44,13 @@ class ExtensionNotPresentConstraintValidationTest(unittest.TestCase):
             zip_name="submission.zip",
             global_constraints=[],
             sub_constraints=[
-                ExtensionNotPresentConstraint(extension=".java"),  # .java is present, should fail
-                ExtensionNotPresentConstraint(extension=".c"),     # .c is present, should fail
-                ExtensionNotPresentConstraint(extension=".cpp"),   # .cpp is not present, should pass
+                ExtensionNotPresentConstraint(not_present_extension=".java"),  # .java is present, should fail
+                ExtensionNotPresentConstraint(not_present_extension=".c"),     # .c is present, should fail
+                ExtensionNotPresentConstraint(not_present_extension=".cpp"),   # .cpp is not present, should pass
                 DirectoryConstraint(  # Directory is present, should pass
                     directory_name="no_txt_in_this_folder",
-                    sub_constraints=[ExtensionNotPresentConstraint(extension=".txt")],  # .txt is present, should fail
+                    sub_constraints=[ExtensionNotPresentConstraint(not_present_extension=".txt")],  # .txt is
+                    # present, should fail
                 ),
             ],
         ),
diff --git a/backend/tests/test_simple_submissions/test_global_constraint.py b/backend/tests/test_simple_submissions/test_global_constraint.py
index e3a7388e..3e7ef346 100644
--- a/backend/tests/test_simple_submissions/test_global_constraint.py
+++ b/backend/tests/test_simple_submissions/test_global_constraint.py
@@ -35,9 +35,9 @@ class GlobalConstraintValidationTest(unittest.TestCase):
         root_constraint=ZipConstraint(
             zip_name="submission.zip",
             global_constraints=[
-                ExtensionNotPresentConstraint(extension=".java"),
-                ExtensionNotPresentConstraint(extension=".c"),
-                ExtensionNotPresentConstraint(extension=".cpp"),
+                ExtensionNotPresentConstraint(not_present_extension=".java"),
+                ExtensionNotPresentConstraint(not_present_extension=".c"),
+                ExtensionNotPresentConstraint(not_present_extension=".cpp"),
                 NotPresentConstraint(file_or_directory_name="dir4"),
             ],
             sub_constraints=[],