@Test
public void testZipReaderWithNoValidFilesReturnsNoFolders()
	throws Exception {

	Mockito.when(
		_zipReader.getEntries()
	).thenReturn(
		Arrays.asList("/a.txt", "/b.txt")
	);
	KBArchive kbArchive = _kbArchiveFactory.createKBArchive(
		1234L, _zipReader);
	Collection<KBArchive.Folder> folders = kbArchive.getFolders();
	Assert.assertTrue(folders.toString(), folders.isEmpty());
}