sequence.remove_work_time to remove IfcRecurrencePattern

Previously it was leaving them orphaned.

src/ifcopenshell-python/test/api/sequence/test_remove_work_time.py

@@ -0,0 +1,41 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2021 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.api
+import ifcopenshell.api.sequence
+
+
+# NOTE: sequence module features relies on entities introduced in IFC4
+# therefore no IFC2X3 tests
+class TestRemoveWorkTime(test.bootstrap.IFC4):
+    def test_remove_work_time(self):
+        self.file.create_entity("IfcProject")
+        work_calendar = ifcopenshell.api.sequence.add_work_calendar(self.file)
+        work_time = ifcopenshell.api.sequence.add_work_time(self.file, work_calendar)
+        ifcopenshell.api.sequence.assign_recurrence_pattern(self.file, work_time)
+        assert len(self.file.by_type("IfcRecurrencePattern")) == 1
+
+        ifcopenshell.api.sequence.remove_work_time(self.file, work_time)
+        assert len(self.file.by_type("IfcWorkTime")) == 0
+        assert len(self.file.by_type("IfcRecurrencePattern")) == 0
+
+
+class TestRemoveWorkTimeIFC4X3(test.bootstrap.IFC4X3, TestRemoveWorkTime):
+    pass