ifc2x3 tests

removed part of test_append_two_type_products_sharing_the_same_material_indirectly_via_a_material_set for ifc2x3 compatibility and removed part is already tested in test_append_two_type_products_sharing_the_same_material_with_properties

src/ifcopenshell-python/test/api/layer/test_assign_layer.py

@@ -37,3 +37,7 @@ class TestAssignLayer(test.bootstrap.IFC4):
         ifcopenshell.api.run("layer.assign_layer", self.file, items=items[2:], layer=layer)
         assert len(layer.AssignedItems) == 4
         assert set(layer.AssignedItems) == set(items)
+
+
+class TestAssignLayerIFC2X3(test.bootstrap.IFC2X3, TestAssignLayer):
+    pass

src/ifcopenshell-python/test/api/layer/test_unassign_layer.py

@@ -37,3 +37,7 @@ class TestUnassignLayer(test.bootstrap.IFC4):
         ifcopenshell.api.run("layer.assign_layer", self.file, items=items, layer=layer)
         ifcopenshell.api.run("layer.unassign_layer", self.file, items=items, layer=layer)
         assert not self.file.by_type("IfcPresentationLayerAssignment")
+
+
+class TestUnassignLayerIFC2X3(test.bootstrap.IFC2X3, TestUnassignLayer):
+    pass