### Question:
OzoneManagerServiceProviderImpl implements OzoneManagerServiceProvider { @VisibleForTesting boolean updateReconOmDBWithNewSnapshot() throws IOException { long startTime = Time.monotonicNowNanos(); DBCheckpoint dbSnapshot = getOzoneManagerDBSnapshot(); metrics.updateSnapshotRequestLatency(Time.monotonicNowNanos() - startTime); if (dbSnapshot != null && dbSnapshot.getCheckpointLocation() != null) { LOG.info("Got new checkpoint from OM : " + dbSnapshot.getCheckpointLocation()); try { omMetadataManager.updateOmDB( dbSnapshot.getCheckpointLocation().toFile()); return true; } catch (IOException e) { LOG.error("Unable to refresh Recon OM DB Snapshot. ", e); } } else { LOG.error("Null snapshot location got from OM."); } return false; } @Inject  OzoneManagerServiceProviderImpl(
      OzoneConfiguration configuration,
      ReconOMMetadataManager omMetadataManager,
      ReconTaskController reconTaskController,
      ReconUtils reconUtils,
      OzoneManagerProtocol ozoneManagerClient); void registerOMDBTasks(); @Override OMMetadataManager getOMMetadataManagerInstance(); @Override void start(); @Override void stop(); @VisibleForTesting String getOzoneManagerSnapshotUrl(); @VisibleForTesting void syncDataFromOM(); OzoneManagerSyncMetrics getMetrics();  }### Answer:
@Test public void testUpdateReconOmDBWithNewSnapshot() throws Exception { OMMetadataManager omMetadataManager = initializeNewOmMetadataManager(temporaryFolder.newFolder()); ReconOMMetadataManager reconOMMetadataManager = getTestReconOmMetadataManager(omMetadataManager, temporaryFolder.newFolder()); writeDataToOm(omMetadataManager, "key_one"); writeDataToOm(omMetadataManager, "key_two"); DBCheckpoint checkpoint = omMetadataManager.getStore() .getCheckpoint(true); File tarFile = createTarFile(checkpoint.getCheckpointLocation()); InputStream inputStream = new FileInputStream(tarFile); ReconUtils reconUtilsMock = getMockReconUtils(); HttpURLConnection httpURLConnectionMock = mock(HttpURLConnection.class); when(httpURLConnectionMock.getInputStream()).thenReturn(inputStream); when(reconUtilsMock.makeHttpCall(any(), anyString(), anyBoolean())) .thenReturn(httpURLConnectionMock); ReconTaskController reconTaskController = getMockTaskController(); OzoneManagerServiceProviderImpl ozoneManagerServiceProvider = new OzoneManagerServiceProviderImpl(configuration, reconOMMetadataManager, reconTaskController, reconUtilsMock, ozoneManagerProtocol); Assert.assertNull(reconOMMetadataManager.getKeyTable() .get("/sampleVol/bucketOne/key_one")); Assert.assertNull(reconOMMetadataManager.getKeyTable() .get("/sampleVol/bucketOne/key_two")); assertTrue(ozoneManagerServiceProvider.updateReconOmDBWithNewSnapshot()); assertNotNull(reconOMMetadataManager.getKeyTable() .get("/sampleVol/bucketOne/key_one")); assertNotNull(reconOMMetadataManager.getKeyTable() .get("/sampleVol/bucketOne/key_two")); }