Fix #7213. IfcTester now supports checking for USERDEFINED predefined types

Can I just take this moment to complain about the overengineered
complexity of how predefined types work in IFC.

src/ifctester/ifctester/facet.py

@@ -227,8 +227,13 @@ class Entity(Facet):
             reason = {"type": "NAME", "actual": inst.is_a().upper()}
 
         if is_pass and self.predefinedType:
-            predefined_type = ifcopenshell.util.element.get_predefined_type(inst)
-            is_pass = predefined_type == self.predefinedType
+            if self.predefinedType == "USERDEFINED":
+                is_pass = ifcopenshell.util.element.is_userdefined_type(inst)
+                if not is_pass:
+                    predefined_type = ifcopenshell.util.element.get_predefined_type(inst)
+            else:
+                predefined_type = ifcopenshell.util.element.get_predefined_type(inst)
+                is_pass = predefined_type == self.predefinedType
 
             if not is_pass:
                 reason = {"type": "PREDEFINEDTYPE", "actual": predefined_type}

src/ifctester/test/test_facet.py

@@ -172,10 +172,10 @@ class TestEntity:
         facet = Entity(name="IFCWALL", predefinedType="USERDEFINED")
         ifc = ifcopenshell.file()
         run(
-            "A predefined type must always specify a meaningful type, not USERDEFINED itself",
+            "A predefined type may specify USERDEFINED itself",
             facet=facet,
             inst=ifc.createIfcWall(PredefinedType="USERDEFINED", ObjectType="WALDO"),
-            expected=False,
+            expected=True,
         )
 
         ifc = ifcopenshell.file()