source: class UtilsTest {
  
      @Test
      public void dictsToTrie_null_item__should_return_null() throws Exception {
  
target:         List<PinyinDict> dicts = new ArrayList<PinyinDict>();
          dicts.add(null);
  
          assertThat(Utils.dictsToTrie(dicts), nullValue());
      }
  
  }