diff --git a/src/caosadvancedtools/models/data_model.py b/src/caosadvancedtools/models/data_model.py
index 1390cf2e45b83c7fd715e674706bc98173db4ebf..e0582365c0106eba08bd0ea6211fb447ca65eb02 100644
--- a/src/caosadvancedtools/models/data_model.py
+++ b/src/caosadvancedtools/models/data_model.py
@@ -148,8 +148,8 @@ class DataModel(dict):
                 else:
                     query = db.Query(f"FIND ENTITY with id={ent.id}")
                     ref = query.execute(unique=True)
-                diff = (describe_diff(*compare_entities(ent, ref
-                                                        ), name=ent.name))
+                diff = (describe_diff(*compare_entities(ent, ref),
+                                      name=ent.name))
 
                 if diff != "":
                     if verbose:
diff --git a/unittests/test_yaml_model_parser.py b/unittests/test_yaml_model_parser.py
index 56c8672b0e073101a38329037d7006e99b88a359..a80ef7131cb0454faba5a7385ea4d0e26c1395ec 100644
--- a/unittests/test_yaml_model_parser.py
+++ b/unittests/test_yaml_model_parser.py
@@ -22,6 +22,8 @@ from tempfile import NamedTemporaryFile
 from pytest import raises, mark
 
 import linkahead as db
+
+import caosadvancedtools
 from caosadvancedtools.models.parser import (TwiceDefinedException,
                                              YamlDefinitionError,
                                              parse_model_from_string,
@@ -714,6 +716,7 @@ test_reference:
         assert "id" in cs[1]
 
     mq = Mock()
+
     def mq_init(self, query):
         self.query = query
 
@@ -729,4 +732,22 @@ test_reference:
 
     stdout, stderr = capfd.readouterr()
 
-  # TODO: test that there were no changes required
+    # TODO: test that there were no changes required
+
+
+def test_setting_values():
+    model = parse_model_from_string("""
+  parameter:
+    datatype: INTEGER
+
+  Simulation:
+    role: Record
+    obligatory_properties:
+      parameter: 26
+  """)
+
+    assert len(model) == 2
+    assert str(model["parameter"])[:-1] == '<Property name="parameter" datatype="INTEGER"/>'
+    assert model["Simulation"].role == "Record"
+    assert model["Simulation"].name == "Simulation"
+    assert model["Simulation"].get_property("parameter").value == 26