TST: Finsh sketch of unittests

unittests/test_error_handling.py

@@ -251,8 +251,19 @@ def test_container_with_faulty_elements():
     assert isinstance(ce, ContainerError)
     # no healthy entity caused an error
     for good in [good_rec, good_prop]:
-        assert not good in te.all_errors
-    
+        assert not good in te.all_entities
+    # all records that caused problems
+    assert {rec_name, rec_auth, rec_par_prop}.issubset(te.all_entities)
+    # the container error contains the errors caused by the records
+    for err in ce.errors:
+        if err.entity.name == rec_name.name:
+            assert isinstance(err, UniqueNamesError)
+        elif err.entity.name == rec_auth.name:
+            assert isinstance(err, AuthorizationException)
+        elif err.entity.name == rec_par_prop.name:
+            # record raises both of them
+            assert (isinstance(err, UnqualifiedParentsError) or
+                    isinstance(err, UnqualifiedPropertiesError))
 
 
 def test_convenience_functions():