diff --git a/src/ifcpatch/test/test_TesselateElements.py b/src/ifcpatch/test/test_TesselateElements.py
new file mode 100644
index 0000000000..83ea349137
--- /dev/null
+++ b/src/ifcpatch/test/test_TesselateElements.py
@@ -0,0 +1,84 @@
+# 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 ifcopenshell.util.representation
+import ifcpatch
+import ifcopenshell
+import ifcopenshell.api.context
+import ifcopenshell.api.geometry
+import ifcopenshell.api.profile
+import ifcopenshell.api.root
+import ifcopenshell.api.unit
+import test.bootstrap
+import ifcopenshell.geom
+import ifcopenshell.util.element
+from ifcopenshell.util.shape_builder import ShapeBuilder
+
+
+class TestTesselateElements(test.bootstrap.IFC4):
+    def test_run(self):
+        is_ifc2x3 = self.file.schema == "IFC2X3"
+        ifcopenshell.api.root.create_entity(self.file, "IfcProject")
+        wall = ifcopenshell.api.root.create_entity(self.file, "IfcWall")
+        model = ifcopenshell.api.context.add_context(self.file, "Model")
+        body = ifcopenshell.api.context.add_context(
+            self.file,
+            context_type="Model",
+            context_identifier="Body",
+            target_view="MODEL_VIEW",
+            parent=model,
+        )
+
+        # Add a length unit just for tests.
+        unit = ifcopenshell.api.unit.add_si_unit(self.file, unit_type="LENGTHUNIT")
+        ifcopenshell.api.unit.assign_unit(self.file, units=[unit])
+
+        builder = ShapeBuilder(self.file)
+        rect = builder.polyline(builder.get_rectangle_coords(), closed=True)
+        extrusion = builder.extrude(rect, 1.0)
+        rep = builder.get_representation(body, extrusion)
+        ifcopenshell.api.geometry.assign_representation(self.file, wall, rep)
+        original_rep_id = rep.id()
+
+        ifcpatch.execute({"file": self.file, "recipe": "TessellateElements", "arguments": ["IfcWall"]})
+
+        # Original representation still exists.
+        assert self.file.by_id(original_rep_id)
+
+        other_reps = [r for r in ifcopenshell.util.representation.get_representations_iter(wall) if r != rep]
+        assert len(other_reps) == 1
+        new_rep = other_reps[0]
+        new_rep.ContextOfItems = body
+        new_rep.RepresentationIdentifier = "Body"
+        new_rep.RepresentationType = "Tesselation"
+        assert len(items := new_rep.Items) == 1
+        item = items[0]
+        if is_ifc2x3:
+            assert item.is_a("IfcFacetedBrep")
+            assert len(faces := item.Outer.CfsFaces) == 12
+            for face in faces:
+                assert len(face.Bounds[0].Bound.Polygon) == 3
+        else:
+            assert item.is_a("IfcPolygonalFaceSet")
+            assert len(faces := item.Faces) == 12
+            for face in faces:
+                assert len(face.CoordIndex) == 3
+
+
+class TestTesselateElementsIFC2X3(test.bootstrap.IFC2X3, TestTesselateElements):
+    pass