/**
  * Test with an empty directory.
  *
  * @throws IOException if there was an I/O error.
  */
 @Test
 public void testEmptyDirectory() throws IOException {
   assertTrue(subtitleProvider.loadSubtitles(subtitleFolder.newFolder().toPath()).isEmpty());
   verify(userPrompt).warning(TRANSLATION_KEY.noSubtitleToCorrect());
 }