Fix bug in IFC2X3 where updating style colours didn't work.

src/blenderbim/test/tool/test_style.py

@@ -131,6 +131,7 @@ class TestGetSurfaceRenderingStyle(NewFile):
 
 class TestGetSurfaceShadingAttributes(NewFile):
     def test_get_colours_from_a_basic_material(self):
+        tool.Ifc.set(ifcopenshell.file())
         obj = bpy.data.materials.new("Material")
         obj.diffuse_color = [1, 1, 1, 1]
         assert subject.get_surface_shading_attributes(obj) == {
@@ -143,6 +144,19 @@ class TestGetSurfaceShadingAttributes(NewFile):
             "Transparency": 0,
         }
 
+    def test_get_colours_from_a_basic_material_ifc2x3(self):
+        tool.Ifc.set(ifcopenshell.file(schema="IFC2X3"))
+        obj = bpy.data.materials.new("Material")
+        obj.diffuse_color = [1, 1, 1, 1]
+        assert subject.get_surface_shading_attributes(obj) == {
+            "SurfaceColour": {
+                "Name": None,
+                "Red": 1,
+                "Green": 1,
+                "Blue": 1,
+            },
+        }
+
 
 class TestGetSurfaceShadingStyle(NewFile):
     def test_run(self):