}
@Test public void testConcatonatedTreesZeroOffset() throws Exception {
DependencyExtractor extractor = new WaCKyDependencyExtractor();
Document doc = new StringDocument(toTabs(DOUBLE_ZERO_OFFSET_PARSE));
DependencyTreeNode[] relations = extractor.readNextTree(doc.reader());
assertEquals(16, relations.length);
testFirstRoot(relations, 2);
testSecondRoot(relations, 13);
}