@Test
public void walkThroughCrawledGraph() {

    assertTrue("Get iterator for crawled graph. Should contain only one empty entry because \"onlyCrawledURIs\" is true", rdburiReferences.walkThroughCrawledGraph(1, true, true).next().getValue().isEmpty());
    assertTrue("Get iterator for crawled graph. Should be not empty because \"onlyCrawledURIs\" is false", rdburiReferences.walkThroughCrawledGraph(1, true, false).hasNext());
    assertFalse("Get iterator for crawled graph. Should be empty because \"offset\" is 2 (skip 2 from the beginning) and we have only 2 entries", rdburiReferences.walkThroughCrawledGraph(2, false, false).hasNext());
}