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[Zygmunt Krynicki <zygmunt.krynicki@xxxxxxxxxxxxx>]

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@xxxxxxxxxxxxx>
---
 plainbox/plainbox/impl/secure/config.py      | 1 +
 plainbox/plainbox/impl/secure/test_config.py | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/plainbox/plainbox/impl/secure/config.py b/plainbox/plainbox/impl/secure/config.py
index 25af8f6..f651359 100644
--- a/plainbox/plainbox/impl/secure/config.py
+++ b/plainbox/plainbox/impl/secure/config.py
@@ -714,6 +714,7 @@ class ChoiceValidator(IValidator):
             return False
 
 
+@understands_Unset
 class NotUnsetValidator(IValidator):
     """
     A validator ensuring that values are set
diff --git a/plainbox/plainbox/impl/secure/test_config.py b/plainbox/plainbox/impl/secure/test_config.py
index a6ab64b..e00815d 100644
--- a/plainbox/plainbox/impl/secure/test_config.py
+++ b/plainbox/plainbox/impl/secure/test_config.py
@@ -367,6 +367,12 @@ class NotUnsetValidatorTests(TestCase):
     class _Config(Config):
         var = Variable()
 
+    def test_understands_Unset(self):
+        """
+        verify that Unset can be handled at all
+        """
+        self.assertTrue(getattr(NotUnsetValidator, "understands_Unset"))
+
     def test_rejects_unset_values(self):
         """
         verify that Unset variables are rejected
-- 
1.9.0