diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/TestContainersLauncher.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/launcher/TestContainersLauncher.java
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+/* Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.
+ */
+
+package org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
+import org.apache.hadoop.yarn.api.records.ApplicationId;
+import org.apache.hadoop.yarn.api.records.ContainerId;
+import org.apache.hadoop.yarn.api.records.SignalContainerCommand;
+import org.apache.hadoop.yarn.event.AsyncDispatcher;
+import org.apache.hadoop.yarn.server.nodemanager.ContainerExecutor;
+import org.apache.hadoop.yarn.server.nodemanager.LocalDirsHandlerService;
+import org.apache.hadoop.yarn.server.nodemanager.NodeManager;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.ContainerManagerImpl;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.application.Application;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.application.ApplicationImpl;
+import org.apache.hadoop.yarn.server.nodemanager.containermanager.container.ContainerImpl;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+import org.mockito.MockitoAnnotations;
+import org.mockito.internal.util.reflection.Whitebox;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.ExecutorService;
+
+import static org.junit.Assert.assertEquals;
+import static org.mockito.Mockito.*;
+
+/**
+ * Tests to verify all the Container's Launcher Events in
+ * {@link ContainersLauncher} are handled as expected.
+ */
+public class TestContainersLauncher {
+
+  @Mock
+  private ApplicationImpl app1;
+
+  @Mock
+  private ContainerImpl container;
+
+  @Mock
+  private ApplicationId appId;
+
+  @Mock
+  private ApplicationAttemptId appAttemptId;
+
+  @Mock
+  private ContainerId containerId;
+
+  @Mock
+  private ContainersLauncherEvent event;
+
+  @Mock
+  private NodeManager.NMContext context;
+
+  @Mock
+  private AsyncDispatcher dispatcher;
+
+  @Mock
+  private ContainerExecutor exec;
+
+  @Mock
+  private LocalDirsHandlerService dirsHandler;
+
+  @Mock
+  private ContainerManagerImpl containerManager;
+
+  @Mock
+  private ExecutorService containerLauncher;
+
+  @Mock
+  private Configuration conf;
+
+  @Mock
+  private ContainerLaunch containerLaunch;
+
+  @InjectMocks
+  private ContainersLauncher tempContainersLauncher = new ContainersLauncher(
+      context, dispatcher, exec, dirsHandler, containerManager);
+
+  private ContainersLauncher spy;
+
+  @Before
+  public void setup() throws IllegalArgumentException, IllegalAccessException {
+    MockitoAnnotations.initMocks(this);
+    ConcurrentMap<ApplicationId, Application> applications =
+        new ConcurrentHashMap<>();
+    applications.put(appId, app1);
+    spy = spy(tempContainersLauncher);
+    conf = doReturn(conf).when(spy).getConfig();
+    when(event.getContainer()).thenReturn(container);
+    when(container.getContainerId()).thenReturn(containerId);
+    when(containerId.getApplicationAttemptId()).thenReturn(appAttemptId);
+    when(containerId.getApplicationAttemptId().getApplicationId())
+        .thenReturn(appId);
+    when(context.getApplications()).thenReturn(applications);
+  }
+
+  @SuppressWarnings("unchecked")
+  @Test
+  public void testLaunchContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException {
+    Map<ContainerId, ContainerLaunch> dummyMap =
+        (Map<ContainerId, ContainerLaunch>) Whitebox.getInternalState(spy,
+            "running");
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.LAUNCH_CONTAINER);
+    assertEquals(0, dummyMap.size());
+    spy.handle(event);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLauncher, Mockito.times(1))
+        .submit(Mockito.any(ContainerLaunch.class));
+  }
+
+  @SuppressWarnings("unchecked")
+  @Test
+  public void testRelaunchContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException {
+    Map<ContainerId, ContainerLaunch> dummyMap =
+        (Map<ContainerId, ContainerLaunch>) Whitebox.getInternalState(spy,
+            "running");
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.RELAUNCH_CONTAINER);
+    assertEquals(0, dummyMap.size());
+    spy.handle(event);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLauncher, Mockito.times(1))
+        .submit(Mockito.any(ContainerRelaunch.class));
+    for (ContainerId cid : dummyMap.keySet()) {
+      Object o = dummyMap.get(cid);
+      assertEquals(true, (o instanceof ContainerRelaunch));
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  @Test
+  public void testRecoverContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException {
+    Map<ContainerId, ContainerLaunch> dummyMap =
+        (Map<ContainerId, ContainerLaunch>) Whitebox.getInternalState(spy,
+            "running");
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.RECOVER_CONTAINER);
+    assertEquals(0, dummyMap.size());
+    spy.handle(event);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLauncher, Mockito.times(1))
+        .submit(Mockito.any(RecoveredContainerLaunch.class));
+    for (ContainerId cid : dummyMap.keySet()) {
+      Object o = dummyMap.get(cid);
+      assertEquals(true, (o instanceof RecoveredContainerLaunch));
+    }
+  }
+
+  @Test
+  public void testRecoverPausedContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException {
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.RECOVER_PAUSED_CONTAINER);
+    spy.handle(event);
+    Mockito.verify(containerLauncher, Mockito.times(1))
+        .submit(Mockito.any(RecoverPausedContainerLaunch.class));
+  }
+
+  @Test
+  public void testCleanupContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException, IOException {
+    Map<ContainerId, ContainerLaunch> dummyMap = Collections
+        .synchronizedMap(new HashMap<ContainerId, ContainerLaunch>());
+    dummyMap.put(containerId, containerLaunch);
+    Whitebox.setInternalState(spy, "running", dummyMap);
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.CLEANUP_CONTAINER);
+    doNothing().when(containerLaunch).cleanupContainer();
+    spy.handle(event);
+    assertEquals(0, dummyMap.size());
+    Mockito.verify(containerLaunch, Mockito.times(1)).cleanupContainer();
+  }
+
+  @Test
+  public void testCleanupContainerForReINITEvent()
+      throws IllegalArgumentException, IllegalAccessException, IOException {
+    Map<ContainerId, ContainerLaunch> dummyMap = Collections
+        .synchronizedMap(new HashMap<ContainerId, ContainerLaunch>());
+    dummyMap.put(containerId, containerLaunch);
+    Whitebox.setInternalState(spy, "running", dummyMap);
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.CLEANUP_CONTAINER_FOR_REINIT);
+    doNothing().when(containerLaunch).cleanupContainer();
+    spy.handle(event);
+    assertEquals(0, dummyMap.size());
+    Mockito.verify(containerLaunch, Mockito.times(1)).cleanupContainer();
+  }
+
+  @Test
+  public void testSignalContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException, IOException {
+    Map<ContainerId, ContainerLaunch> dummyMap = Collections
+        .synchronizedMap(new HashMap<ContainerId, ContainerLaunch>());
+    dummyMap.put(containerId, containerLaunch);
+
+    SignalContainersLauncherEvent dummyEvent =
+        mock(SignalContainersLauncherEvent.class);
+    when(dummyEvent.getContainer()).thenReturn(container);
+    when(container.getContainerId()).thenReturn(containerId);
+    when(containerId.getApplicationAttemptId()).thenReturn(appAttemptId);
+    when(containerId.getApplicationAttemptId().getApplicationId())
+        .thenReturn(appId);
+
+    Whitebox.setInternalState(spy, "running", dummyMap);
+    when(dummyEvent.getType())
+        .thenReturn(ContainersLauncherEventType.SIGNAL_CONTAINER);
+    when(dummyEvent.getCommand())
+        .thenReturn(SignalContainerCommand.GRACEFUL_SHUTDOWN);
+    doNothing().when(containerLaunch)
+        .signalContainer(SignalContainerCommand.GRACEFUL_SHUTDOWN);
+    spy.handle(dummyEvent);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLaunch, Mockito.times(1))
+        .signalContainer(SignalContainerCommand.GRACEFUL_SHUTDOWN);
+  }
+
+  @Test
+  public void testPauseContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException, IOException {
+    Map<ContainerId, ContainerLaunch> dummyMap = Collections
+        .synchronizedMap(new HashMap<ContainerId, ContainerLaunch>());
+    dummyMap.put(containerId, containerLaunch);
+    Whitebox.setInternalState(spy, "running", dummyMap);
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.PAUSE_CONTAINER);
+    doNothing().when(containerLaunch).pauseContainer();
+    spy.handle(event);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLaunch, Mockito.times(1)).pauseContainer();
+  }
+
+  @Test
+  public void testResumeContainerEvent()
+      throws IllegalArgumentException, IllegalAccessException, IOException {
+    Map<ContainerId, ContainerLaunch> dummyMap = Collections
+        .synchronizedMap(new HashMap<ContainerId, ContainerLaunch>());
+    dummyMap.put(containerId, containerLaunch);
+    Whitebox.setInternalState(spy, "running", dummyMap);
+    when(event.getType())
+        .thenReturn(ContainersLauncherEventType.RESUME_CONTAINER);
+    doNothing().when(containerLaunch).resumeContainer();
+    spy.handle(event);
+    assertEquals(1, dummyMap.size());
+    Mockito.verify(containerLaunch, Mockito.times(1)).resumeContainer();
+  }
+}