assertFalse(activeStatuses.contains(CrawlerStatus.DONE));

        // Create empty EnumSet
        EnumSet<CrawlerStatus> emptySet = EnumSet.noneOf(CrawlerStatus.class);
        assertEquals(0, emptySet.size());

        // Create EnumSet with range
        EnumSet<CrawlerStatus> rangeSet = EnumSet.range(CrawlerStatus.INITIALIZING, CrawlerStatus.RUNNING);
        assertEquals(2, rangeSet.size());