diff --git a/spec/shared/evaluator_behavior.rb b/spec/shared/evaluator_behavior.rb
index <HASH>..<HASH> 100644
--- a/spec/shared/evaluator_behavior.rb
+++ b/spec/shared/evaluator_behavior.rb
@@ -40,6 +40,9 @@ shared_examples_for 'predicate evaluator' do
       expect(evaluation.output).to be(true)
 
       evaluation = object.inverse.evaluation(valid_input)
+
+      expect(evaluation.success?).to be(true)
+      expect(evaluation.output).to be(false)
     end
 
   end
Add more expectations to predicate inverse shared behavior