@Test
 public void testRestore() throws Exception {
   fileStorageMedia = new FileStorageMedia.Builder().setStateFile(randomTmpFile).build();
   copyDataToTmpFile();
   final List<JsonExperimentContextData> jsonExperimentContextData = fileStorageMedia.restore();
   assertEquals(3, jsonExperimentContextData.size());
 }
 @Test
 public void testPersist() throws Exception {
   fileStorageMedia.persist(new ArrayList<>());
   assertTrue(randomTmpFile.getTotalSpace() > 0L);
 }