private File file2b = getFile(dir1, "f2b"); // changed version of file2
@Test
public void delegatesHandlingOfAddedAndDeletedResources() {
LibraryPresenceDao presenceDao = mock(LibraryPresenceDao.class);
when(presenceDao.getFiles(dir1)).thenReturn(set(file1, file2, file3));
when(presenceDao.getSubdirectories(dir1)).thenReturn(set(dir2));
presenceService.setLibraryPresenceDao(presenceDao);
file2b.setSize(file2.getSize() + 1);
PollableChannel presenceChannel = presenceService.libraryPresenceChannel;