assertTrue(docsEnum instanceof Siren10DocsEnum);
final Siren10DocsNodesAndPositionsEnum e = ((Siren10DocsEnum) docsEnum).getDocsNodesAndPositionsEnum();
assertEquals(-1, e.doc());
assertEquals(0, e.nodeFreqInDoc());
assertTrue(e.nextDocument());
assertEquals(0, e.doc());
assertEquals(2, e.nodeFreqInDoc());
assertTrue(e.nextDocument());
assertEquals(1, e.doc());
assertEquals(1, e.nodeFreqInDoc());
assertTrue(e.nextDocument());