diff --git a/src/stdatamodels/jwst/datamodels/tests/test_models.py b/src/stdatamodels/jwst/datamodels/tests/test_models.py
index cd3fefde..49c778fd 100644
--- a/src/stdatamodels/jwst/datamodels/tests/test_models.py
+++ b/src/stdatamodels/jwst/datamodels/tests/test_models.py
@@ -202,8 +202,9 @@ def test_update_from_datamodel(tmp_path, datamodel_for_update, only, extra_fits)
             # Verify the fixture returns keywords we expect
             assert oldim.meta.telescope == "JWST"
             assert oldim.meta.wcsinfo.crval1 == 5
-            assert oldim.extra_fits.PRIMARY.header == [["FOO", "BAR", ""]]
-            assert oldim.extra_fits.SCI.header == [["BAZ", "BUZ", ""]]
+            with pytest.raises(DeprecationWarning, "Manipulation of extra_fits is deprecated"):
+                assert oldim.extra_fits.PRIMARY.header == [["FOO", "BAR", ""]]
+                assert oldim.extra_fits.SCI.header == [["BAZ", "BUZ", ""]]
 
             newim.update(oldim, only=only, extra_fits=extra_fits)
         newim.save(path)
diff --git a/tests/test_fits.py b/tests/test_fits.py
index e53fc216..8d5f84c1 100644
--- a/tests/test_fits.py
+++ b/tests/test_fits.py
@@ -93,7 +93,8 @@ def test_extra_fits(tmp_path):
         hdul.writeto(file_path, overwrite=True)
 
     with DataModel(file_path) as dm:
-        assert any(h for h in dm.extra_fits.PRIMARY.header if h == ["FOO", "BAR", ""])
+        with pytest.raises(DeprecationWarning, "Manipulation of extra_fits is deprecated"):
+            assert any(h for h in dm.extra_fits.PRIMARY.header if h == ["FOO", "BAR", ""])
 
 
 def test_hdu_order(tmp_path):
@@ -600,11 +601,12 @@ def test_no_asdf_extension_extra_fits(tmp_path):
     }
 
     with PureFitsModel((5, 5)) as m:
-        m.extra_fits = {}
-        m.extra_fits.instance.update(extra_fits)
-        assert "ASDF" in m.extra_fits.instance
-        assert "CHECKSUM" in m.extra_fits.ASDF.header[0]
-        assert "DATASUM" in m.extra_fits.ASDF.header[1]
+        with pytest.raises(DeprecationWarning, "Manipulation of extra_fits is deprecated"):
+            m.extra_fits = {}
+            m.extra_fits.instance.update(extra_fits)
+            assert "ASDF" in m.extra_fits.instance
+            assert "CHECKSUM" in m.extra_fits.ASDF.header[0]
+            assert "DATASUM" in m.extra_fits.ASDF.header[1]
         m.save(path)
 
     with fits.open(path, memmap=False) as hdulist:
@@ -612,7 +614,8 @@ def test_no_asdf_extension_extra_fits(tmp_path):
 
     with PureFitsModel(path) as m:
         with pytest.raises(AttributeError):
-            m.extra_fits  # noqa: B018
+            with pytest.raises(DeprecationWarning, "Manipulation of extra_fits is deprecated"):
+                m.extra_fits  # noqa: B018
 
 
 def test_ndarray_validation(tmp_path):