Improve filling operators and tests (#1754)

* Test add_filling operator

* Test Remove filling

* Update bootstrap defs for filling test

* Fix possible errors in add_filling and remove_filling

* Enable adding fillings from the opening object ui

* Typo

* Revert "Enable adding fillings from the opening object ui"

This reverts commit b217860840.

* Display a list of all fillings when an opening is selected

* Ensure an IfcOpeningElement can't be voided

* merge 0.7.0

* Add test cases for filling operators

* Test Opening operators

* Delete related fill relations on object deletion

* Remove try/except

* typo

* Minor fix

* Remove boolean modifier on previous element when voiding a new one

* Don't show ui elements when not applicable

* Test filling void b with an element that already fills void a
correctly removes the filling from void a

Co-authored-by: Dion Moult <dion@thinkmoult.com>

src/blenderbim/blenderbim/bim/module/void/operator.py

@@ -34,7 +34,18 @@ class AddOpening(bpy.types.Operator):
         return IfcStore.execute_ifc_operator(self, context)
 
     def _execute(self, context):
+        self.file = IfcStore.get_file()
         obj = context.scene.objects.get(self.obj, context.active_object)
+        if obj is None:
+            return {"FINISHED"}
+        element_id = obj.BIMObjectProperties.ifc_definition_id
+        if not element_id:
+            return {"FINISHED"}
+        element = self.file.by_id(element_id)
+        if element.is_a("IfcOpeningElement"):
+            self.report({"WARNING"}, "An IfcOpeningElement can't be voided")
+            return {"FINISHED"}
+
         opening = bpy.data.objects.get(self.opening)
         if opening is None:
             return {"FINISHED"}
@@ -45,14 +56,22 @@ class AddOpening(bpy.types.Operator):
                 return {"FINISHED"}
             bpy.ops.bim.assign_class(obj=opening.name, ifc_class="IfcOpeningElement", context_id=body_context.id())
 
-        self.file = IfcStore.get_file()
-        element_id = obj.BIMObjectProperties.ifc_definition_id
+        # If the IfcOpeningElement aleady voids another object, remove the boolean modifier
+        opening_element = self.file.by_id(opening.BIMObjectProperties.ifc_definition_id)
+        if opening_element.VoidsElements:
+            other_obj = IfcStore.get_element(opening_element.VoidsElements[0].RelatingBuildingElement.id())
+            try:
+                modifier = next(m for m in other_obj.modifiers if m.type == "BOOLEAN" and m.object == opening)
+                other_obj.modifiers.remove(modifier)
+            except StopIteration:
+                pass
+
         ifcopenshell.api.run(
             "void.add_opening",
             self.file,
             **{
-                "opening": self.file.by_id(opening.BIMObjectProperties.ifc_definition_id),
-                "element": self.file.by_id(element_id),
+                "opening": opening_element,
+                "element": element,
             },
         )
         Data.load(self.file, element_id)
@@ -129,7 +148,7 @@ class AddFilling(bpy.types.Operator):
         self.file = IfcStore.get_file()
         element_id = obj.BIMObjectProperties.ifc_definition_id
         opening_id = opening.BIMObjectProperties.ifc_definition_id
-        if not element_id or not opening_id:
+        if not element_id or not opening_id or element_id == opening_id:
             return {"FINISHED"}
         ifcopenshell.api.run(
             "void.add_filling",
@@ -154,11 +173,14 @@ class RemoveFilling(bpy.types.Operator):
 
     def _execute(self, context):
         obj = bpy.data.objects.get(self.obj) if self.obj else context.active_object
+        if not obj:
+            return {"FINISHED"}
         self.file = IfcStore.get_file()
-        ifcopenshell.api.run(
-            "void.remove_filling", self.file, **{"element": self.file.by_id(obj.BIMObjectProperties.ifc_definition_id)}
-        )
-        Data.load(IfcStore.get_file(), obj.BIMObjectProperties.ifc_definition_id)
+        element_id = obj.BIMObjectProperties.ifc_definition_id
+        if not element_id:
+            return {"FINISHED"}
+        ifcopenshell.api.run("void.remove_filling", self.file, **{"element": self.file.by_id(element_id)})
+        Data.load(self.file, element_id)
         return {"FINISHED"}
 
 

src/blenderbim/blenderbim/bim/module/void/ui.py

@@ -40,9 +40,10 @@ class BIM_PT_voids(Panel):
 
     def draw(self, context):
         props = context.active_object.BIMObjectProperties
+        file = IfcStore.get_file()
         if props.ifc_definition_id not in Data.products:
-            Data.load(IfcStore.get_file(), props.ifc_definition_id)
-
+            Data.load(file, props.ifc_definition_id)
+        active_object_is_an_opening = file.by_id(props.ifc_definition_id).is_a("IfcOpeningElement")
         row = self.layout.row(align=True)
         if len(context.selected_objects) == 2:
             op = row.operator("bim.add_opening", icon="ADD", text="Add Opening")
@@ -71,14 +72,16 @@ class BIM_PT_voids(Panel):
             row.label(text="Select an opening and an element to modify", icon="HELP")
 
         opening_ids = Data.products[props.ifc_definition_id]
-        if not opening_ids:
+        if not opening_ids and not active_object_is_an_opening:
             row = self.layout.row(align=True)
             row.label(text="No Openings", icon="SELECT_SUBTRACT")
         for opening_id in opening_ids:
             opening = Data.openings[opening_id]
             if opening["HasFillings"]:
                 for filling_id in opening["HasFillings"]:
-                    filling = Data.fillings[filling_id]
+                    filling = Data.fillings.get(filling_id)
+                    if filling is None:
+                        continue
                     row = self.layout.row(align=True)
                     row.label(text=opening["Name"], icon="SELECT_SUBTRACT")
                     row.label(text=filling["Name"], icon="SELECT_INTERSECT")
@@ -87,8 +90,18 @@ class BIM_PT_voids(Panel):
                 row.label(text=opening["Name"], icon="SELECT_SUBTRACT")
             op = row.operator("bim.remove_opening", icon="X", text="")
             op.opening_id = opening_id
-
-        if props.ifc_definition_id not in Data.fillings:
+        if props.ifc_definition_id in Data.openings:
+            for filling_id in Data.openings[props.ifc_definition_id]["HasFillings"]:
+                filling = Data.fillings.get(filling_id)
+                if filling is None:
+                    continue
+                row = self.layout.row(align=True)
+                row.label(text=filling["Name"], icon="SELECT_INTERSECT")
+                op = row.operator("bim.remove_filling", icon="X", text="")
+                op.obj = IfcStore.get_element(filling_id).name
+        if active_object_is_an_opening:
+            pass
+        elif props.ifc_definition_id not in Data.fillings:
             row = self.layout.row(align=True)
             row.prop(context.scene.VoidProperties, "desired_opening", text="", icon="SELECT_INTERSECT")
             row.operator("bim.add_filling", icon="ADD", text="")

src/blenderbim/blenderbim/bim/operator.py

@@ -663,11 +663,17 @@ class OverrideDelete(bpy.types.Operator):
         return context.window_manager.invoke_confirm(self, event)
 
     def _execute(self, context):
+        file = IfcStore.get_file()
         for obj in context.selected_objects:
             if obj.BIMObjectProperties.ifc_definition_id:
-                element = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
+                element = file.by_id(obj.BIMObjectProperties.ifc_definition_id)                
+                if element.FillsVoids:
+                    self.delete_filling_element(element)
                 if element.is_a("IfcOpeningElement"):
-                    self.delete_opening_element(element)
+                    if element.VoidsElements:
+                        self.delete_opening_element(element)
+                    # for rel in element.HasFillings:                            
+                    #     self.delete_filling_element(rel.RelatedBuildingElement)
                 elif element.HasOpenings:
                     for rel in element.HasOpenings:
                         self.delete_opening_element(rel.RelatedOpeningElement)
@@ -677,3 +683,7 @@ class OverrideDelete(bpy.types.Operator):
     def delete_opening_element(self, element):
         obj = IfcStore.get_element(element.VoidsElements[0].RelatingBuildingElement.id())
         bpy.ops.bim.remove_opening(opening_id=element.id(), obj=obj.name)
+
+    def delete_filling_element(self, element):
+        obj = IfcStore.get_element(element.id())
+        bpy.ops.bim.remove_filling(obj=obj.name)

src/blenderbim/test/bim/bootstrap.py

@@ -40,9 +40,10 @@ class NewFile:
     def setup(self):
         IfcStore.purge()
         bpy.ops.wm.read_homefile(app_template="")
-        while bpy.data.objects:
-            bpy.data.objects.remove(bpy.data.objects[0])
-        bpy.ops.outliner.orphans_purge(do_local_ids=True, do_linked_ids=True, do_recursive=True)
+        if bpy.data.objects:
+            while bpy.data.objects:
+                bpy.data.objects.remove(bpy.data.objects[0])
+            bpy.ops.outliner.orphans_purge(do_local_ids=True, do_linked_ids=True, do_recursive=True)
 
 
 class NewIfc:
@@ -83,7 +84,7 @@ def i_add_a_cube_of_size_size_at_location(size, location):
 
 
 def the_object_name_is_selected(name):
-    bpy.ops.object.select_all(action="DESELECT")
+    i_deselect_all_objects()
     additionally_the_object_name_is_selected(name)
 
 
@@ -94,6 +95,10 @@ def additionally_the_object_name_is_selected(name):
     bpy.context.view_layer.objects.active = obj
     obj.select_set(True)
 
+def i_deselect_all_objects():
+    bpy.context.view_layer.objects.active = None
+    bpy.ops.object.select_all(action="DESELECT")
+
 
 def i_am_on_frame_number(number):
     bpy.context.scene.frame_set(int(number))
@@ -278,6 +283,42 @@ def the_object_name_is_not_voided_by_void(name, void):
             assert False, "A void was found"
 
 
+def the_object_name_is_not_voided(name):
+    ifc = IfcStore.get_file()
+    element = ifc.by_id(the_object_name_exists(name).BIMObjectProperties.ifc_definition_id)
+    if any(element.HasOpenings):
+        assert False, "An opening was found"
+
+
+def the_object_name_is_not_a_void(name):
+    ifc = IfcStore.get_file()
+    element = ifc.by_id(the_object_name_exists(name).BIMObjectProperties.ifc_definition_id)
+    if any(element.VoidsElements):
+        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, "No filling found"
+
+
+def the_void_name_is_not_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):
+        assert False, "A filling was found"
+
+
+def the_object_name_is_not_a_filling(name):
+    ifc = IfcStore.get_file()
+    element = ifc.by_id(the_object_name_exists(name).BIMObjectProperties.ifc_definition_id)
+    if any(element.FillsVoids):
+        assert False, "A filling was found"
+
+
 def the_object_name_should_display_as_mode(name, mode):
     assert the_object_name_exists(name).display_type == mode
 
@@ -305,6 +346,7 @@ definitions = {
     'I add a cube of size "([0-9]+)" at "(.*)"': i_add_a_cube_of_size_size_at_location,
     'the object "(.*)" is selected': the_object_name_is_selected,
     'additionally the object "(.*)" is selected': additionally_the_object_name_is_selected,
+    'I deselect all objects': i_deselect_all_objects,
     'I am on frame "([0-9]+)"': i_am_on_frame_number,
     'I set "(.*)" to "(.*)"': i_set_prop_to_value,
     '"(.*)" is "(.*)"': prop_is_value,
@@ -333,10 +375,15 @@ definitions = {
     'the object "(.*)" has no boolean difference by "(.*)"': the_object_name1_has_no_boolean_difference_by_name2,
     'the object "(.*)" is voided by "(.*)"': the_object_name_is_voided_by_void,
     'the object "(.*)" is not voided by "(.*)"': the_object_name_is_not_voided_by_void,
+    'the object "(.*)" is not a void': the_object_name_is_not_a_void,
+    'the object "(.*)" is not voided': the_object_name_is_not_voided,
     '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,
     "nothing interesting happens": lambda: None,
+    'the void "(.*)" is filled by "(.*)"': the_void_name_is_filled_by_filling,
+    'the void "(.*)" is not filled by "(.*)"': the_void_name_is_not_filled_by_filling,
+    'the object "(.*)" is not a filling': the_object_name_is_not_a_filling,
 }
 
 

src/blenderbim/test/bim/module/void/test_operator.py

@@ -38,6 +38,99 @@ class TestAddOpening(test.bim.bootstrap.NewFile):
         And the object "IfcWall/Cube" is voided by "Cube"
         """
 
+    @test.bim.bootstrap.scenario
+    def test_adding_an_opening_on_an_opening(self):
+        """An opening can't legally be voided by another opening"""
+        return """
+        Given an empty IFC project
+        And 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 "IfcOpeningElement"
+        And I press "bim.assign_class"
+        And the object "IfcOpeningElement/Cube" is selected
+        And additionally the object "IfcOpeningElement/Cube.001" is selected
+        And I press "bim.add_opening(opening='IfcOpeningElement/Cube', obj='IfcOpeningElement/Cube.001')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the object "IfcOpeningElement/Cube" should display as "WIRE"
+        And the object "IfcOpeningElement/Cube" is not a void
+        Then the object "IfcOpeningElement/Cube.001" is an "IfcOpeningElement"
+        And the object "IfcOpeningElement/Cube.001" should display as "WIRE"
+        Then the object "IfcOpeningElement/Cube.001" has no boolean difference by "IfcOpeningElement/Cube"
+        And the object "IfcOpeningElement/Cube.001" is not voided by "Cube"
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_an_opening_on_a_null_object(self):
+        return """
+        Given an empty IFC project
+        And 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 deselect all objects
+        And I press "bim.add_opening(opening='IfcOpeningElement/Cube')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the object "IfcOpeningElement/Cube" should display as "WIRE"
+        And the object "IfcOpeningElement/Cube" is not a void
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_an_opening_on_a_non_ifc_object(self):
+        return """
+        Given an empty IFC project
+        And 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 press "bim.add_opening(opening='IfcOpeningElement/Cube', obj='Cube')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the object "IfcOpeningElement/Cube" should display as "WIRE"
+        And the object "IfcOpeningElement/Cube" is not a void
+        And the object "Cube" is not an IFC element
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_an_opening_with_a_null_object(self):
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcWall"
+        And I press "bim.assign_class"
+        And I deselect all objects
+        And I press "bim.add_opening(obj='IfcWall/Cube')"
+        Then the object "IfcWall/Cube" is an "IfcWall"
+        And the object "IfcWall/Cube" is not voided
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_an_opening_to_element_b_with_a_void_that_already_voids_element_a(self):
+        """An opening can legally void at most one element"""
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcWall"
+        And I press "bim.assign_class"
+        And I add a cube
+        And I press "bim.add_opening(opening='Cube', obj='IfcWall/Cube')"
+        And I add a cube
+        And the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcWall"
+        And I press "bim.assign_class"
+        And I press "bim.add_opening(opening='IfcOpeningElement/Cube', obj='IfcWall/Cube.001')"
+        Then the object "IfcWall/Cube" is not voided
+        And the object "IfcWall/Cube" has no boolean difference by "IfcOpeningElement/Cube"  
+        And the object "IfcWall/Cube.001" is voided by "Cube"
+        And the object "IfcWall/Cube.001" has a boolean difference by "IfcOpeningElement/Cube"  
+        """
+
 
 class TestRemoveOpening(test.bim.bootstrap.NewFile):
     @test.bim.bootstrap.scenario
@@ -115,3 +208,197 @@ 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
+        And 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"
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling_on_null_object(self):
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcDoor"
+        And I press "bim.assign_class"
+        And the object "IfcDoor/Cube" is selected
+        And I press "bim.add_filling(obj='IfcDoor/Cube')"
+        Then the object "IfcDoor/Cube" is an "IfcDoor"
+        And the object "IfcDoor/Cube" is not a filling
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling_on_itself(self):
+        return """
+        Given an empty IFC project
+        And 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 the object "IfcOpeningElement/Cube" is selected
+        And I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcOpeningElement/Cube')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the void "IfcOpeningElement/Cube" is not filled by "Cube"
+        And the object "IfcOpeningElement/Cube" is not a filling
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling_with_a_non_ifc_object(self):
+        return """
+        Given an empty IFC project
+        And 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 "IfcOpeningElement/Cube" is selected
+        And I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='Cube')"
+        Then the object "Cube" is not an IFC element
+        And the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the void "IfcOpeningElement/Cube" is not filled by "Cube"
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling_on_a_non_ifc_object(self):
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcDoor"
+        And I press "bim.assign_class"
+        And I add a cube
+        And the object "Cube" is selected
+        And I press "bim.add_filling(opening='Cube', obj='IfcDoor/Cube')"
+        Then the object "Cube" is not an IFC element
+        And the object "IfcDoor/Cube" is an "IfcDoor"
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_adding_a_filling_on_opening_b_when_the_filling_alread_fills_element_a(self):
+        return """
+        Given an empty IFC project
+        And 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 I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcDoor/Cube')"
+        And I add a cube
+        And the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcOpeningElement"
+        And I press "bim.assign_class"
+        And I press "bim.add_filling(opening='IfcOpeningElement/Cube.001', obj='IfcDoor/Cube')"
+        Then the void "IfcOpeningElement/Cube" is not filled by "Cube"
+        And the void "IfcOpeningElement/Cube.001" is filled by "Cube"
+        """
+
+
+class TestRemoveFilling(test.bim.bootstrap.NewFile):
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling(self):
+        return """
+        Given an empty IFC project
+        And 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 I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcDoor/Cube')"
+        And I press "bim.remove_filling(obj='IfcDoor/Cube')"
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the object "IfcDoor/Cube" is an "IfcDoor"
+        And the void "IfcOpeningElement/Cube" is not filled by "Cube"
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling_which_is_not_an_ifc_object(self):
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I press "bim.remove_filling(obj='Cube')"
+        Then the object "Cube" is not an IFC element
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling_which_is_not_a_filling(self):
+        return """
+        Given an empty IFC project
+        And I add a cube
+        When the object "Cube" is selected
+        And I set "scene.BIMRootProperties.ifc_class" to "IfcDoor"
+        And I press "bim.assign_class"
+        And I press "bim.remove_filling(obj='IfcDoor/Cube')"
+        Then the object "IfcDoor/Cube" is an "IfcDoor"
+        And the object "IfcDoor/Cube" is not a filling
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling_which_is_null(self):
+        return """
+        Given an empty IFC project
+        And I press "bim.remove_filling()"
+        Then nothing interesting happens
+        """
+
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling_using_deletion_on_the_filling(self):
+        return """
+        Given an empty IFC project
+        And 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 I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcDoor/Cube')"
+        And the object "IfcDoor/Cube" is selected
+        And I delete the selected objects
+        Then the object "IfcOpeningElement/Cube" is an "IfcOpeningElement"
+        And the void "IfcOpeningElement/Cube" is not filled by "Cube"
+        """    
+
+    @test.bim.bootstrap.scenario
+    def test_removing_a_filling_using_deletion_on_the_opening(self):
+        return """
+        Given an empty IFC project
+        And 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 I press "bim.add_filling(opening='IfcOpeningElement/Cube', obj='IfcDoor/Cube')"
+        And the object "IfcOpeningElement/Cube" is selected
+        And I delete the selected objects
+        Then the object "IfcDoor/Cube" is an "IfcDoor"
+        And the object "IfcDoor/Cube" is not a filling
+        """