private PersistentID getPersistentID(final String diskStoreName) {
    for (DiskStore diskStore : getCache().listDiskStores()) {
      if (diskStore.getName().equals(diskStoreName)) {
        return ((DiskStoreImpl) diskStore).getPersistentID();
      }
    }
    throw new AssertionError("Failed to find disk store " + diskStoreName);
  }
Verifies that a user deployed jar file is included as part of the backup.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/backup/IncrementalBackupIntegrationTest.java