diff --git a/src/blenderbim/test/bim/bootstrap.py b/src/blenderbim/test/bim/bootstrap.py
index f57d35bcde..74f464bc44 100644
--- a/src/blenderbim/test/bim/bootstrap.py
+++ b/src/blenderbim/test/bim/bootstrap.py
@@ -264,6 +264,14 @@ def the_object_name_is_not_voided_by_void(name, void):
             assert False, "A void was found"
 
 
+def the_void_name_is_filled_by_filling(name, filling):
+    ifc = IfcStore.get_file()
+    element = ifc.by_id(the_object_name_exists(name).BIMObjectProperties.ifc_definition_id)
+    if any(rel.RelatedBuildingElement.Name == filling for rel in element.HasFillings):
+        return True
+    assert False, f"Filling was not found"
+
+
 def the_object_name_should_display_as_mode(name, mode):
     assert the_object_name_exists(name).display_type == mode
 
@@ -317,6 +325,7 @@ definitions = {
     'the object "(.*)" should display as "(.*)"': the_object_name_should_display_as_mode,
     'the object "(.*)" has "([0-9]+)" vertices': the_object_name_has_number_vertices,
     'the object "(.*)" is at "(.*)"': the_object_name_is_at_location,
+    'the object "(.*)" is filled by "(.*)"': the_void_name_is_filled_by_filling,
 }
 
 
diff --git a/src/blenderbim/test/bim/module/void/test_operator.py b/src/blenderbim/test/bim/module/void/test_operator.py
index 96cba2d83e..6ab8c4d356 100644
--- a/src/blenderbim/test/bim/module/void/test_operator.py
+++ b/src/blenderbim/test/bim/module/void/test_operator.py
@@ -113,3 +113,25 @@ class TestRemoveOpening(test.bim.bootstrap.NewFile):
         And I delete the selected objects
         Then the object "Cube" is not an IFC element
         """
+
+
+class TestAddFilling(test.bim.bootstrap.NewFile):
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling(self):
+        return """
+        Given an empty IFC project
+        Given I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcOpeningElement"
+        And I press "bim.assign_class"
+        And I add a cube
+        And the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcDoor"
+        And I press "bim.assign_class"
+        And the object "IfcOpeningElement/Cube" is selected
+        And I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcDoor/Cube')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the object "IfcOpeningElement/Cube" should display as "WIRE"
+        And the object "IfcDoor/Cube" is an "IfcDoor"
+        And the void "IfcOpeningElement/Cube" is filled by "Cube"
+        """