assigning material styles to reuse existing styled item + tests

src/ifcopenshell-python/test/api/style/test_assign_material_style.py

@@ -22,9 +22,35 @@ import ifcopenshell
 import ifcopenshell.api
 
 
-# TODO: test assigning styles without material constituents
 class TestAssignMaterialStyle(test.bootstrap.IFC4):
-    def test_update_shape_aspect_representaitons_items_styles_if_material_is_part_of_matching_material_constituents(
+    def test_run(self):
+        material = ifcopenshell.api.run("material.add_material", self.file)
+        context = self.file.createIfcGeometricRepresentationContext()
+        style = self.file.createIfcSurfaceStyle()
+        ifcopenshell.api.run("style.assign_material_style", self.file, material=material, style=style, context=context)
+
+        assert len(material.HasRepresentation) == 1
+        definition = material.HasRepresentation[0]
+        assert len(definition.Representations) == 1
+        representation = definition.Representations[0]
+        assert representation.is_a("IfcStyledRepresentation")
+        assert representation.ContextOfItems == context
+        assert len(representation.Items) == 1
+        item = representation.Items[0]
+        assert item.is_a("IfcStyledItem")
+        assert item.Styles == (style,)
+
+        style2 = self.file.createIfcSurfaceStyle()
+        ifcopenshell.api.run("style.assign_material_style", self.file, material=material, style=style2, context=context)
+
+        # reuse existing elements and reassign the style
+        assert material.HasRepresentation == (definition,)
+        assert definition.Representations == (representation,)
+        assert len(representation.Items) == 1
+        assert representation.Items[0] == item
+        assert representation.Items[0].Styles == (style2,)
+
+    def test_update_shape_aspect_representations_items_styles_if_material_is_part_of_matching_material_constituents(
         self,
     ):
         element = ifcopenshell.api.run("root.create_entity", self.file, ifc_class="IfcWall")

src/ifcopenshell-python/test/api/style/test_unassign_material_style.py

@@ -0,0 +1,47 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2022 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of IfcOpenShell.
+#
+# IfcOpenShell is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# IfcOpenShell is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
+
+import pytest
+import test.bootstrap
+import ifcopenshell
+import ifcopenshell.api
+
+
+class TestAssignMaterialStyle(test.bootstrap.IFC4):
+    def test_run(self):
+        material = ifcopenshell.api.run("material.add_material", self.file)
+        context = self.file.createIfcGeometricRepresentationContext()
+        style = self.file.createIfcSurfaceStyle()
+        ifcopenshell.api.run("style.assign_material_style", self.file, material=material, style=style, context=context)
+
+        # unassign 1 style
+        style2 = self.file.createIfcSurfaceStyle()
+        item = self.file.by_type("IfcStyledItem")[0]
+        item.Styles = item.Styles + (style2,)
+        ifcopenshell.api.run(
+            "style.unassign_material_style", self.file, material=material, style=style2, context=context
+        )
+        assert item.Styles == (style,)
+
+        # unassign last style
+        ifcopenshell.api.run(
+            "style.unassign_material_style", self.file, material=material, style=style, context=context
+        )
+        assert len(self.file.by_type("IfcMaterialDefinitionRepresentation")) == 0
+        assert len(self.file.by_type("IfcStyledRepresentation")) == 0
+        assert len(self.file.by_type("IfcStyledItem")) == 0