More bugfixes in the glossary protection guard module

tests/test_validation.py

@@ -177,6 +177,34 @@ def test_valid_glossary_parses():
     )
 
     assert glossary.glossary[0].name == "Lyra"
+    assert glossary.glossary[0].plural is None
+
+
+def test_glossary_accepts_optional_plural():
+    glossary = parse_glossary_yaml(
+        """
+        glossary:
+          - name: "Godfrey"
+            plural: "Godfreys"
+            category: npc
+            summary: "Godfrey is an NPC."
+        """
+    )
+
+    assert glossary.glossary[0].plural == "Godfreys"
+
+
+def test_glossary_rejects_empty_plural():
+    with pytest.raises(AuditaValidationError):
+        parse_glossary_yaml(
+            """
+            glossary:
+              - name: "Godfrey"
+                plural: ""
+                category: npc
+                summary: "Godfrey is an NPC."
+            """
+        )
 
 
 def test_glossary_rejects_empty_entries():