@Test
public void testEmtpyDirMatching() throws Exception {

  TaildirMatcher tm = new TaildirMatcher("empty",
                                         tmpDir.getAbsolutePath() + File.separator + ".*",
                                         isCachingNeeded);
  List<File> files = tm.getMatchingFiles();
  assertNotNull(msgEmptyDir, files);
  assertTrue(msgEmptyDir, files.isEmpty());
}