Fix #1576. Managing IfcSystem subtypes is now possible.

src/ifcopenshell-python/test/api/system/test_add_system.py

@@ -0,0 +1,28 @@
+# 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 test.bootstrap
+import ifcopenshell.api
+
+
+class TestAddSystem(test.bootstrap.IFC4):
+    def test_adding_a_system(self):
+        system = ifcopenshell.api.run("system.add_system", self.file, ifc_class="IfcSystem")
+        system2 = ifcopenshell.api.run("system.add_system", self.file, ifc_class="IfcDistributionSystem")
+        assert system.is_a("IfcSystem")
+        assert system2.is_a("IfcDistributionSystem")

src/ifcopenshell-python/test/api/system/test_remove_system.py

@@ -0,0 +1,27 @@
+# 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 test.bootstrap
+import ifcopenshell.api
+
+
+class TestRemoveSystem(test.bootstrap.IFC4):
+    def test_removing_a_system(self):
+        system = ifcopenshell.api.run("system.add_system", self.file, ifc_class="IfcSystem")
+        ifcopenshell.api.run("system.remove_system", self.file, system=system)
+        assert len(self.file.by_type("IfcSystem")) == 0