diff --git a/tests/emmet-core/vasp/test_materials.py b/tests/emmet-core/vasp/test_materials.py
index 33222945bf..ba2883dfe7 100644
--- a/tests/emmet-core/vasp/test_materials.py
+++ b/tests/emmet-core/vasp/test_materials.py
@@ -32,5 +32,18 @@ def test_make_mat(test_tasks):
         MaterialsDoc.from_tasks(bad_task_group, use_statics=False)
 
 
+def test_make_deprecated_mat(test_tasks):
+    bad_task_group = [
+        task for task in test_tasks if task.task_type != TaskType.Structure_Optimization
+    ]
+
+    material = MaterialsDoc.construct_deprecated_material(bad_task_group)
+
+    assert material.deprecated
+    assert material.formula_pretty == "Si"
+    assert len(material.task_ids) == 3
+    assert material.entries is None
+
+
 def test_schema():
     MaterialsDoc.schema()