### Question:
Wordpath { public Vertex combine(int from, int length) { this.connect(from, length); if (wordnet.isNotContains(from, length)) { return wordnet.put(from, length); } else { return wordnet.getVertex(from, length); } } Wordpath(Wordnet wordnet); Wordnet getWordnet(); Iterable<Vertex> getBestPathWithBE(); Iterator<Vertex> iteratorVertex(); Vertex combine(int from, int length); void combine(Vertex vertex); void findunloadVertext(Consumer<Vertex> consumer); int wordCount(); int wordCountInPath(); WordPointer wordPointer(); boolean willCutOtherWords(int from, int len); @Override String toString(); BitSet getBitSet(); void reset();  }### Answer:
@Test public void combine() throws Exception { String line = "我的中国心"; Wordpath wordPath = new Wordpath(new Wordnet(line.toCharArray())); wordPath.combine(0, 2); wordPath.combine(2, 3); Assert.assertEquals("我的 | 中国心", wordPath.toString()); }