1 files changed, 7 insertions, 1 deletions
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
index 582e61948..f68a4872b 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/runtime/impl/EngineServiceImplTest.java
@@ -171,7 +171,13 @@ public class EngineServiceImplTest {
         esImpl.registerActionListener(null, new DummyApexEventListener());
 
         esImpl.registerActionListener("DummyListener", new DummyApexEventListener());
-        esImpl.deregisterActionListener(null);
+        try {
+            esImpl.deregisterActionListener(null);
+            fail("test should throw an exception");
+        } catch (Exception apEx) {
+            assertEquals("removeEventListener()<-Engine-0:0.0.1,STOPPED, listenerName is null", apEx.getMessage());
+        }
+            
         esImpl.deregisterActionListener("DummyListener");
 
         assertEquals(esImpl, esImpl.getEngineServiceEventInterface());