@Test
public void toPinyin_withZeroDict() throws Exception {

    mPinyinDicts.clear();
    String result = Engine.toPinyin("重庆和长安都很棒!", dictsToTrie(mPinyinDicts), mPinyinDicts, ",", new ForwardLongestSelector());
    String expect = "ZHONG,QING,HE,ZHANG,AN,DOU,HEN,BANG,!";
    assertThat(expect, is(result));
}