Index: tests/conftest.py
===================================================================
--- tests/conftest.py	(revision 3d16c35d3fefcfceff1373475af4a12d4393b8df)
+++ tests/conftest.py	(revision 524040ab9259784d3e2c918c532b7488b20c19f1)
@@ -55,2 +55,11 @@
     )
     return exam
+
+@pytest.fixture
+def null_media():
+    """Provide a default NullMediaItem instance for tests."""
+    return NullMediaItem(
+        domain="GEN",
+        etype=EntityType.MEDIA,
+        state=EntityState.DRAFT
+    )