diff --git a/unittests/test_tool.py b/unittests/test_tool.py
index 0b7632d4d2046d166b17bf2a1e20c0791051e6e7..5d1beb6aba3e3a065c57ce0b5264925d73d884a4 100755
--- a/unittests/test_tool.py
+++ b/unittests/test_tool.py
@@ -505,35 +505,6 @@ def test_split_into_inserts_and_updates_with_copy_attr(crawler_mocked_identifiab
     crawler.identifiableAdapter.retrieve_identified_record_for_record.assert_called()
 
 
-def test_all_references_are_existing_already2(crawler):
-    registered_identifiables = {
-        "C": db.Record().add_parent("C").add_property("a"),
-        "D": db.Record().add_parent("D").add_property("a").add_property("b")}
-    crawler.identifiableAdapter.get_registered_identifiable = Mock(side_effect=partial(
-        basic_ident_lookup, idents=registered_identifiables))
-
-    # one reference with id
-    assert crawler.all_references_are_existing_already(
-        db.Record().add_parent("C").add_property('a', 123))
-    # one ref with id one with Entity with id
-    assert crawler.all_references_are_existing_already(db.Record().add_parent("D")
-                                                       .add_property('a', 123)
-                                                       .add_property('b', db.Record(id=123)))
-    a = db.Record(name="A").add_parent("C").add_property("a", 12311)
-    # one ref with id one with Entity without id
-    assert not crawler.all_references_are_existing_already(db.Record().add_parent("D")
-                                                           .add_property('a', 123)
-                                                           .add_property('b', a))
-    crawler.add_identified_record_to_local_cache(a)
-    # one ref with id one with Entity which is cached
-    # (RT C has a as identifying prop which is given in this example)
-    assert crawler.all_references_are_existing_already(db.Record().add_parent("D")
-                                                       .add_property('a', 123)
-                                                       .add_property('b', a))
-    # if this ever fails, the mock up may be removed
-    crawler.identifiableAdapter.get_registered_identifiable.assert_called()
-
-
 def test_all_references_are_existing_already(crawler):
     # Simulate remote server content by using the names to identify records
     # There are only two known Records with name A and B
@@ -544,18 +515,29 @@ def test_all_references_are_existing_already(crawler):
                                                .add_property("d").add_property("e"),
                                                }))
 
+    # one reference with id -> check
     assert crawler.all_references_are_existing_already(
         db.Record(name="C").add_parent("C").add_property('d', 123))
+    # one ref with Entity with id -> check
     assert crawler.all_references_are_existing_already(db.Record(name="C")
                                                        .add_property('d', db.Record(id=123)))
+    # one ref with id one with Entity with id (mixed) -> check
     assert crawler.all_references_are_existing_already(db.Record(name="C").add_parent("D")
                                                        .add_property('d', 123)
                                                        .add_property('b', db.Record(id=123)))
+    # entity to be referenced in the following
     a = db.Record(name="C").add_parent("C").add_property("d", 12311)
+    # one ref with id one with Entity without id (but not identifying) -> check
+    assert crawler.all_references_are_existing_already(db.Record(name="C").add_parent("C")
+                                                       .add_property('d', 123)
+                                                       .add_property('e', a))
+
+    # one ref with id one with Entity without id (mixed) -> fail
     assert not crawler.all_references_are_existing_already(db.Record(name="D").add_parent("D")
                                                            .add_property('d', 123)
                                                            .add_property('e', a))
     crawler.add_identified_record_to_local_cache(a)
+    # one ref with id one with Entity without id but in cache -> check
     assert crawler.all_references_are_existing_already(db.Record(name="D").add_parent("D")
                                                        .add_property('d', 123)
                                                        .add_property('e', a))
@@ -563,34 +545,20 @@ def test_all_references_are_existing_already(crawler):
     crawler.identifiableAdapter.get_registered_identifiable.assert_called()
 
 
-def test_can_be_checked_externally2(crawler):
-    registered_identifiables = {
-        "C": db.Record().add_parent("C").add_property("a"),
-        "D": db.Record().add_parent("D").add_property("a").add_property("b")}
-    crawler.identifiableAdapter.get_registered_identifiable = Mock(side_effect=partial(
-        basic_ident_lookup, idents=registered_identifiables))
-    assert crawler.can_be_checked_externally(db.Record().add_parent("C").add_property('a', 123))
-    assert crawler.can_be_checked_externally(db.Record().add_parent("C")
-                                             .add_property('a', db.Record(id=123)))
-    assert crawler.can_be_checked_externally(db.Record().add_parent("D")
-                                             .add_property('a', 123)
-                                             .add_property('b', db.Record(id=123)))
-
-    assert not crawler.can_be_checked_externally(db.Record().add_parent("D")
-                                                 .add_property('a', 123)
-                                                 .add_property('b', db.Record()))
-
-
 def test_can_be_checked_externally(crawler, ident):
     assert crawler.can_be_checked_externally(
         db.Record().add_parent("Person").add_property('last_name', 123).add_property('first_name', 123))
+    # id and rec with id
     assert crawler.can_be_checked_externally(db.Record().add_parent("Person")
                                              .add_property('first_name', 123)
                                              .add_property('last_name', db.Record(id=123)))
+    # id and rec with id and one unneeded prop
     assert crawler.can_be_checked_externally(db.Record().add_parent("Person")
                                              .add_property('first_name', 123)
+                                             .add_property('stuff', db.Record())
                                              .add_property('last_name', db.Record(id=123)))
 
+    # one identifying prop is missing
     assert not crawler.can_be_checked_externally(db.Record().add_parent("Person")
                                                  .add_property('first_name', 123)
                                                  .add_property('last_name', db.Record()))