Added negative UT

Author: mudit1289

tez-dag/src/test/java/org/apache/tez/dag/app/TestDAGAppMaster.java

@@ -475,7 +475,7 @@ public void testBadProgress() throws Exception {
   }
 
   @Test
-  public void testShutdownTezAMWithNoCurrentRunningDAG() throws Exception {
+  public void testShutdownTezAMWithNoCurrentRunningDAGAndConfigSet() throws Exception {
 
     ApplicationId appId = ApplicationId.newInstance(1, 1);
     ApplicationAttemptId attemptId = ApplicationAttemptId.newInstance(appId, 2);
@@ -491,6 +491,23 @@ public void testShutdownTezAMWithNoCurrentRunningDAG() throws Exception {
     Assert.assertEquals(dam.getState(), DAGAppMasterState.FAILED);
   }
 
+  @Test
+  public void testShutdownTezAMWithNoCurrentRunningDAGAndConfigUnset() throws Exception {
+
+    ApplicationId appId = ApplicationId.newInstance(1, 1);
+    ApplicationAttemptId attemptId = ApplicationAttemptId.newInstance(appId, 2);
+    DAGAppMasterForTest dam = new DAGAppMasterForTest(attemptId, true);
+    TezConfiguration conf = new TezConfiguration(false);
+    conf.setBoolean(TezConfiguration.DAG_RECOVERY_ENABLED, false);
+    conf.setBoolean(TezConfiguration.TEZ_AM_FAIL_ON_SHUTDOWN_AND_NO_RUNNING_DAGS, false);
+    dam.init(conf);
+    dam.start();
+    verify(dam.mockScheduler).setShouldUnregisterFlag();
+    verify(dam.mockShutdown).shutdown();
+
+    Assert.assertEquals(dam.getState(), DAGAppMasterState.SUCCEEDED);
+  }
+
   @SuppressWarnings("deprecation")
   private void testDagCredentials(boolean doMerge) throws IOException {
     TezConfiguration conf = new TezConfiguration();