diff --git a/src/blenderbim/test/bim/feature/material.feature b/src/blenderbim/test/bim/feature/material.feature
index 3e850021bb..87ce5b82d6 100644
--- a/src/blenderbim/test/bim/feature/material.feature
+++ b/src/blenderbim/test/bim/feature/material.feature
@@ -435,17 +435,20 @@ Scenario: Remove material set layer
     And the object "Cube" is selected
     And I set "scene.BIMRootProperties.ifc_class" to "IfcWall"
     And I press "bim.assign_class"
+
     And I add an empty
     And the object "Empty" is selected
     And I set "scene.BIMRootProperties.ifc_product" to "IfcElementType"
     And I set "scene.BIMRootProperties.ifc_class" to "IfcWallType"
     And I press "bim.assign_class"
+
     And I press "bim.add_material(obj='')"
     And I set "active_object.BIMObjectMaterialProperties.material_type" to "IfcMaterialLayerSet"
     And I press "bim.assign_material"
+
     And I press "bim.enable_editing_assigned_material"
     And the variable "material_set" is "{ifc}.by_type('IfcMaterialLayerSet')[0].id()"
-    And I press "bim.remove_layer(layer={ifc}.by_id({material_set}).MaterialLayers[0].id())"
+
     And I press "bim.add_layer(layer_set={material_set})"
-    When I press "bim.remove_layer(layer={ifc}.by_id({material_set}).MaterialLayers[0].id())"
-    Then nothing happens
+    And I press "bim.remove_layer(layer={ifc}.by_id({material_set}).MaterialLayers[0].id())"
+    Then I press "bim.remove_layer(layer={ifc}.by_id({material_set}).MaterialLayers[0].id())" and expect error "Error: At least one layer must exist"
diff --git a/src/blenderbim/test/bim/test_feature.py b/src/blenderbim/test/bim/test_feature.py
index 821d2d484d..5cbdf39897 100644
--- a/src/blenderbim/test/bim/test_feature.py
+++ b/src/blenderbim/test/bim/test_feature.py
@@ -159,6 +159,21 @@ def i_add_a_plane_of_size_size_at_location(size, location):
     bpy.ops.mesh.primitive_plane_add(size=float(size), location=[float(co) for co in location.split(",")])
 
 
+@then(parsers.parse('I press "{operator}" and expect error "{error_msg}"'))
+def i_press_operator_and_expect_error(operator, error_msg):
+    operator = replace_variables(operator)
+    try:
+        if "(" in operator:
+            exec(f"bpy.ops.{operator}")
+        else:
+            exec(f"bpy.ops.{operator}()")
+        assert False, f"Operator bpy.ops.{operator} ran without exception '{error_msg}'"
+    except Exception as e:     
+        actual_error_msg = str(e).strip()
+        if str(e).strip() != error_msg:
+            traceback.print_exc()
+            assert False, f"Got different exception running bpy.ops.{operator} - '{actual_error_msg}' instead of '{error_msg}'"
+
 @given(parsers.parse('I press "{operator}"'))
 @when(parsers.parse('I press "{operator}"'))
 def i_press_operator(operator):