add test and update ci

src/ifcopenshell-python/test/util/test_unit_conversion.py

@@ -0,0 +1,49 @@
+# IfcOpenShell - IFC toolkit and geometry engine
+# Copyright (C) 2023 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 pathlib
+
+import pytest
+
+import ifcopenshell.util.unit
+
+UNITS_FIXTURE_DIR = pathlib.Path(__file__).parent.parent / "fixtures" / "units"
+
+
+@pytest.mark.parametrize("ifc_file", UNITS_FIXTURE_DIR.glob("*.ifc"))
+def test_file_units_length_convert(ifc_file):
+    f = ifcopenshell.open(ifc_file)
+    project_unit = ifcopenshell.util.unit.get_project_unit(f, "LENGTHUNIT")
+    if project_unit.Prefix == "MILLI":
+        target_units = "METERS"
+        scale = 0.001
+    else:
+        target_units = "MILLIMETERS"
+        scale = 1000
+
+    new_f = ifcopenshell.util.unit.convert_file_length_units(f, target_units)
+
+    for element, attr, val in ifcopenshell.util.unit.iter_element_and_attributes_per_type(new_f, "IfcLengthMeasure"):
+        elem_id = element.id()
+        original_element = f.by_id(elem_id)
+        original_val = getattr(original_element, attr.name())
+        if isinstance(original_val, tuple):
+            # assert element is equal to original element times scale
+            assert val == tuple([v * scale for v in original_val])
+        else:
+            # assert element is equal to original element times scale
+            assert val == original_val * scale