dart - 如何在Dart中测试流

如何在Dart中测试流？我有以下代码:

test('words are reading sequentially correct', () {
  WordTrackerInterface wordTracker = WordTracker.byContent('0 1 2');
  wordTracker.setWordsCountPerChunk(1);
  var stream = wordTracker.nextWordStringStream();

  expect(
      stream,
      emitsInOrder(List<Word>.generate(
          6, (i) => i > 2 ? Word('') : Word(i.toString()))));

  for (int i = 0; i < 6; i++) {
    wordTracker.nextWord();
  }
});

我需要测试成员数据Word::content(即String)是否等于emitsInOrder中提供的数据。

类似以下内容的流:

expect(
    stream,
    emitsInOrder(List<Word>.generate(
        6, (i) => i > 2 ? Word('') : Word(i.toString()))),
    expect((Word actual, Word expected) {
  return actual.content == expected.content;
}));

最佳答案

尝试使用async/await和expectLater

test('words are reading sequentially correct', () async {
  WordTrackerInterface wordTracker = WordTracker.byContent('0 1 2');
  wordTracker.setWordsCountPerChunk(1);
  var stream = wordTracker.nextWordStringStream();

  await expectLater(
      stream,
      emitsInOrder(List<Word>.generate(
          6, (i) => i > 2 ? Word('') : Word(i.toString()))));

  for (int i = 0; i < 6; i++) {
    wordTracker.nextWord();
  }
});