Improve robustness of unit testing

Issue-ID: POLICY-2630
Signed-off-by: huaxing <huaxing.jin@est.tech>
Change-Id: I6475f9272c1a770836af537c13b23e486b66ac3e

2 files changed, 25 insertions, 22 deletions

diff --git a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListener.java b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListener.java
index 2e8218a99..57c547b8c 100644
--- a/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListener.java
+++ b/services/services-engine/src/main/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListener.java
@@ -77,7 +77,7 @@ public class EngDepMessageListener implements MessageListener<Message>, Runnable
 
     // The message listener thread and stopping flag
     private Thread messageListenerThread;
-    private boolean stopOrderedFlag = false;
+    private volatile boolean stopOrderedFlag = false;
 
     // The message queue is used to hold messages prior to forwarding to Apex
     private final BlockingQueue<MessageBlock<Message>> messageQueue = new LinkedBlockingDeque<>();
@@ -149,7 +149,7 @@ public class EngDepMessageListener implements MessageListener<Message>, Runnable
     @Override
     public void run() {
         // Take messages off the queue and forward them to the Apex engine
-        while (messageListenerThread.isAlive() && !stopOrderedFlag) {
+        while (!stopOrderedFlag) {
             pollAndHandleMessage();
         }
     }
diff --git a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListenerTest.java b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListenerTest.java
index f755a669c..9f5329e55 100644
--- a/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListenerTest.java
+++ b/services/services-engine/src/test/java/org/onap/policy/apex/service/engine/engdep/EngDepMessageListenerTest.java
@@ -5,36 +5,37 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- * 
+ *
  * SPDX-License-Identifier: Apache-2.0
  * ============LICENSE_END=========================================================
  */
 
 package org.onap.policy.apex.service.engine.engdep;
 
+import static org.awaitility.Awaitility.await;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
 
 import java.net.InetSocketAddress;
 import java.util.ArrayList;
 import java.util.List;
-
+import java.util.concurrent.BlockingQueue;
 import org.java_websocket.WebSocket;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
+import org.mockito.internal.util.reflection.Whitebox;
 import org.onap.policy.apex.core.infrastructure.messaging.impl.ws.messageblock.MessageBlock;
-import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
 import org.onap.policy.apex.core.protocols.Message;
 import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineInfo;
 import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineServiceInfo;
@@ -57,7 +58,7 @@ public class EngDepMessageListenerTest {
 
     /**
      * Set up mocking of the engine service facade.
-     * 
+     *
      * @throws ApexException on engine service facade setup errors
      */
     @Before
@@ -72,6 +73,8 @@ public class EngDepMessageListenerTest {
     public void testMessageListener() throws ApexException {
         DummyEngineService dummyEngineService = new DummyEngineService();
         EngDepMessageListener listener = new EngDepMessageListener(dummyEngineService);
+        BlockingQueue<?> messageQueue
+            = (BlockingQueue<?>) Whitebox.getInternalState(listener, "messageQueue");
         listener.startProcessorThread();
 
         try {
@@ -84,49 +87,49 @@ public class EngDepMessageListenerTest {
         List<Message> messageList = new ArrayList<>();
         messageList.add(new StartEngine(new AxArtifactKey("Start:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals("Start:0.0.1", dummyEngineService.getStartEngineKey().getId());
 
         messageList.clear();
         messageList.add(new StopEngine(new AxArtifactKey("Stop:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals("Stop:0.0.1", dummyEngineService.getStopEngineKey().getId());
 
         messageList.clear();
         messageList.add(new StartPeriodicEvents(new AxArtifactKey("StartPeriodic:0.0.1"), "12345"));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals(12345, dummyEngineService.getPeriodicPeriod());
 
         messageList.clear();
         messageList.add(new StopPeriodicEvents(new AxArtifactKey("StopPeriodic:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals(0, dummyEngineService.getPeriodicPeriod());
 
         messageList.clear();
         messageList.add(new GetEngineInfo(new AxArtifactKey("EngineInfo:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals("EngineInfo:0.0.1", dummyEngineService.getRuntimeInfoKey().getId());
 
         messageList.clear();
         messageList.add(new GetEngineStatus(new AxArtifactKey("EngineStatus:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals("EngineStatus:0.0.1", dummyEngineService.getStatusKey().getId());
 
         messageList.clear();
         messageList.add(new GetEngineServiceInfo(new AxArtifactKey("EngineServiceInfo:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals(1, dummyEngineService.getModelKeyGetCalled());
 
         messageList.clear();
         messageList.add(new UpdateModel(new AxArtifactKey("UpdateModel:0.0.1")));
         listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-        ThreadUtilities.sleep(50);
+        await().until(messageQueue::isEmpty);
         assertEquals("UpdateModel:0.0.1", dummyEngineService.getUpdateModelKey().getId());
 
         try {
@@ -134,35 +137,35 @@ public class EngDepMessageListenerTest {
             messageList.add(new Response(new AxArtifactKey("UpdateModel:0.0.1"), false,
                             new GetEngineInfo(new AxArtifactKey("EngineInfo:0.0.1"))));
             listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-            ThreadUtilities.sleep(50);
+            await().until(messageQueue::isEmpty);
             assertEquals("UpdateModel:0.0.1", dummyEngineService.getUpdateModelKey().getId());
 
             messageList.clear();
             Message badMessage0 = new DummyMessage(null, null);
             messageList.add(badMessage0);
             listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-            ThreadUtilities.sleep(50);
+            await().until(messageQueue::isEmpty);
 
             messageList.clear();
             Message badMessage1 = new DummyMessage(new DummyAction(null), null);
             messageList.add(badMessage1);
             listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-            ThreadUtilities.sleep(50);
+            await().until(messageQueue::isEmpty);
 
             messageList.clear();
             Message badMessage2 = new DummyMessage(new DummyAction("throw exception"), null);
             messageList.add(badMessage2);
             listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-            ThreadUtilities.sleep(50);
+            await().until(messageQueue::isEmpty);
 
+            messageList.clear();
             Mockito.doReturn(false).when(webSocketMock).isOpen();
             messageList.add(new StartEngine(new AxArtifactKey("Start:0.0.1")));
             listener.onMessage(new MessageBlock<>(messageList, webSocketMock));
-            ThreadUtilities.sleep(50);
+            await().until(messageQueue::isEmpty);
         } catch (Exception e) {
             fail("test should not throw exceptions on bad messages");
         }
         listener.stopProcessorThreads();
-        ThreadUtilities.sleep(50);
     }
 }