@Test
public void importAllParallel() throws InterruptedException, ExecutionException, IOException {

    List<Boolean> isLoadPresent = Collections.synchronizedList(new ArrayList<>());
    Importers.importAll(fileSystem.getPath(WORK_DIR), testImporter, true, n -> isLoadPresent.add(n.getLoad("LOAD") != null));
    assertEquals(2, isLoadPresent.size());
    isLoadPresent.forEach(Assert::assertTrue);
}