ENH: Include container error code

unittests/test_error_handling.py

@@ -204,11 +204,12 @@ def test_parent_and_properties_errors():
 
 
 def test_container_with_faulty_elements():
-    """Container with valid and invalid entities. All faulty entities have
-    to be reflected correctly in the errors list of the
+    """Code 12; container with valid and invalid entities. All faulty
+    entities have to be reflected correctly in the errors list of the
     TransactionError raised by the container.
 
     """
+    container_code = 12
     prop_code = 114
     parent_code = 116
     name_code = 152
@@ -222,7 +223,8 @@ def test_container_with_faulty_elements():
         name="TestProp1"), entity_code)
     prop2 = _add_error_message_to_entity(db.Property(
         name="TestProp2"), no_entity_code)
-    cont = db.Container()
+    cont = _add_error_message_to_entity(db.Container(),
+                                        container_code)
     # healthy record and property
     good_rec = db.Record(name="TestRecord1")
     good_prop = db.Property(name="TestProp3")
@@ -242,6 +244,15 @@ def test_container_with_faulty_elements():
         raise_errors(cont)
     # TODO: Check whether all errors and all broken entities are
     # listed correctly. The healthy entities must not appear.
+    te = e.value
+    # only container on first level:
+    assert len(te.errors) == 1
+    ce = te.errors[0]
+    assert isinstance(ce, ContainerError)
+    # no healthy entity caused an error
+    for good in [good_rec, good_prop]:
+        assert not good in te.all_errors
+    
 
 
 def test_convenience_functions():