### Question:
StateBackupService { public static Path headerFileName( final Path backupDir, final int fileNumber, final boolean compressed) { return backupDir.resolve( String.format("besu-header-backup-%04d.%sdat", fileNumber, compressed ? "c" : "r")); } StateBackupService(
      final String besuVesion,
      final Blockchain blockchain,
      final Path backupDir,
      final EthScheduler scheduler,
      final WorldStateStorage worldStateStorage); Path getBackupDir(); BackupStatus requestBackup(
      final long block, final boolean compress, final Optional<Path> backupDir); static Path dataFileToIndex(final Path dataName); static Path accountFileName(
      final Path backupDir,
      final long targetBlock,
      final int fileNumber,
      final boolean compressed); static Path headerFileName(
      final Path backupDir, final int fileNumber, final boolean compressed); static Path bodyFileName(
      final Path backupDir, final int fileNumber, final boolean compressed); static Path receiptFileName(
      final Path backupDir, final int fileNumber, final boolean compressed);  }### Answer:
@Test public void headerFileName() { assertThat(StateBackupService.headerFileName(backupDir, 42, false).toString()) .isEqualTo("/tmp/backup/besu-header-backup-0042.rdat"); assertThat(StateBackupService.headerFileName(backupDir, 46, true).toString()) .isEqualTo("/tmp/backup/besu-header-backup-0046.cdat"); }