New feature to unlink Blender materials and IFC materials

src/blenderbim/test/tool/test_container.py

@@ -127,7 +127,7 @@ class TestImportContainers(NewFile):
         bpy.ops.bim.copy_class(obj=tool.Ifc.get_object(storey1).name)
         storey2 = tool.Ifc.get().by_type("IfcBuildingStorey")[1]
         storey2.Name = "Lower"
-        storey2.ObjectPlacement.RelativePlacement.Location.Coordinates = (0., 0., -100.)
+        storey2.ObjectPlacement.RelativePlacement.Location.Coordinates = (0.0, 0.0, -100.0)
         subject.import_containers(building)
         props = bpy.context.scene.BIMSpatialProperties
         assert len(props.containers) == 2

src/blenderbim/test/tool/test_material.py

@@ -0,0 +1,43 @@
+# BlenderBIM Add-on - OpenBIM Blender Add-on
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of BlenderBIM Add-on.
+#
+# BlenderBIM Add-on is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# BlenderBIM Add-on 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+import ifcopenshell
+import blenderbim.core.tool
+import blenderbim.tool as tool
+from test.bim.bootstrap import NewFile
+from blenderbim.tool.material import Material as subject
+
+
+class TestLink(NewFile):
+    def test_run(self):
+        obj = bpy.data.materials.new("Material")
+        ifc = ifcopenshell.file()
+        material = ifc.createIfcMaterial()
+        subject.link(material, obj)
+        assert obj.BIMObjectProperties.ifc_definition_id == material.id()
+
+
+class TestUnlink(NewFile):
+    def test_run(self):
+        obj = bpy.data.materials.new("Material")
+        ifc = ifcopenshell.file()
+        material = ifc.createIfcMaterial()
+        subject.link(material, obj)
+        subject.unlink(obj)
+        assert obj.BIMObjectProperties.ifc_definition_id == 0