Revert "removed shutdown testcase (maybe, calling System.exit)"

This reverts commit e14b071.

Author: sureshanaparti

plugins/maintenance/src/test/java/org/apache/cloudstack/maintenance/ManagementServerMaintenanceManagerImplTest.java

@@ -288,6 +288,19 @@ public void triggerShutdownCmdMsInUpStateAndOtherMsHostsInPreparingState() {
         });
     }
 
+    @Test
+    public void triggerShutdownCmd() {
+        ManagementServerHostVO msHost = mock(ManagementServerHostVO.class);
+        Mockito.when(msHost.getState()).thenReturn(ManagementServerHost.State.ReadyToShutDown);
+        Mockito.when(msHostDao.findById(1L)).thenReturn(msHost);
+        TriggerShutdownCmd cmd = mock(TriggerShutdownCmd.class);
+        Mockito.when(cmd.getManagementServerId()).thenReturn(1L);
+        Mockito.when(clusterManagerMock.execute(anyString(), anyLong(), anyString(), anyBoolean())).thenReturn("Success");
+
+        spy.triggerShutdown(cmd);
+        Mockito.verify(clusterManagerMock, Mockito.times(1)).execute(anyString(), anyLong(), anyString(), anyBoolean());
+    }
+
     @Test
     public void prepareForMaintenanceAndCancelFromMaintenanceState() {
         Mockito.doNothing().when(jobManagerMock).disableAsyncJobs();