fix: Account for inversion in NOT_IN operator where context_value is None (#235)

Author: brtkwr

UnleashClient/constraints/Constraint.py

@@ -181,7 +181,7 @@ def apply(self, context: dict = None) -> bool:
             else:
                 # This is a special case in the client spec - so it's getting it's own handler here
                 if self.operator is ConstraintOperators.NOT_IN:
-                    return True
+                    constraint_check = True
 
         except Exception as excep:  # pylint: disable=broad-except
             LOGGER.info("Could not evaluate context %s!  Error: %s", self.context_name, excep)

tests/unit_tests/test_constraints.py

@@ -15,7 +15,6 @@ def constraint_NOTIN():
     yield Constraint(mock_constraints.CONSTRAINT_DICT_NOTIN)
 
 
-
 def test_constraint_IN_match(constraint_IN):
     constraint = constraint_IN
     context = {
@@ -39,6 +38,16 @@ def test_constraint_IN_missingcontext(constraint_IN):
     assert not constraint.apply({})
 
 
+def test_constraint_NOTIN_missingcontext(constraint_NOTIN):
+    constraint = constraint_NOTIN
+    assert constraint.apply({})
+
+
+def test_constraint_NOTIN_missingcontext_inversion():
+    constraint = Constraint(mock_constraints.CONSTRAINT_DICT_NOTIN_INVERT)
+    assert not constraint.apply({})
+
+
 def test_constraint_NOTIN_match(constraint_NOTIN):
     constraint = constraint_NOTIN
     context = {

tests/utilities/mocks/mock_constraints.py

@@ -20,6 +20,18 @@
     }
 
 
+CONSTRAINT_DICT_NOTIN_INVERT = \
+    {
+        "contextName": "appName",
+        "operator": "NOT_IN",
+        "values": [
+            "test",
+            "test2"
+        ],
+        "inverted": True
+    }
+
+
 CONSTRAINT_DICT_STR_INVERT = \
     {
         "contextName": "customField",
@@ -29,6 +41,7 @@
         "inverted": True
     }
 
+
 CONSTRAINT_DICT_STR_CONTAINS_CI = \
     {
         "contextName": "customField",