TST: added a small test for the treatement of None values

unittests/test_sync_graph.py

@@ -29,7 +29,7 @@ from caoscrawler.exceptions import (ImpossibleMergeError,
                                     MissingIdentifyingProperty)
 from caoscrawler.identifiable import Identifiable
 from caoscrawler.identifiable_adapters import CaosDBIdentifiableAdapter
-from caoscrawler.sync_graph import SyncGraph
+from caoscrawler.sync_graph import SyncGraph, _set_each_scalar_value
 from caoscrawler.sync_node import SyncNode, parent_in_list, property_in_list
 
 from itertools import product
@@ -604,3 +604,15 @@ def test_detect_circular_dependency(crawler_mocked_identifiable_retrieve, caplog
     assert "Found circular dependency" in caplog.text
     assert "\n--------\n\n> Parent: C\n\n>> Name: a\n[\'C\']" in caplog.text
     caplog.clear()
+
+
+def test_set_each_scalar_value():
+    """Test whether properties with None as value are treated appropriately."""
+    a = SyncNode(db.Record().add_parent("RT1").add_property(name="bla"),
+                 db.RecordType().add_property("is_referenced_by", ["RT2"]))
+    _set_each_scalar_value(a, lambda x: False, None)
+    _set_each_scalar_value(a, lambda x: isinstance(x, SyncNode), None)
+    _set_each_scalar_value(a, lambda x: x is None, lambda x: 42)
+    assert a.properties[0].value == 42
+    _set_each_scalar_value(a, lambda x: x == 42, lambda x: None)
+    assert a.properties[0].value is None