@Test
public void testValidateDownloadedS3FilesZeroFiles() throws IOException
{

    File targetLocalDirectory = Paths.get(LOCAL_TEMP_PATH.toString(), TEST_S3_KEY_PREFIX).toFile();
    // Create an empty target local directory.
    assertTrue(targetLocalDirectory.mkdirs());
    // Create a storage unit entity without any storage files.
    StorageUnit storageUnit = createStorageUnit(TEST_S3_KEY_PREFIX, null, null);
    // Validate an empty set of the downloaded S3 files.
    storageFileHelper.validateDownloadedS3Files(LOCAL_TEMP_PATH.toString(), TEST_S3_KEY_PREFIX, storageUnit);
}