如何在Dart中测试流 [英] How to test a stream in Dart

问题描述

如何在Dart中测试流?我有以下代码:

  test('单词顺序读取正确'，(){WordTrackerInterface wordTracker = WordTracker.byContent('0 1 2');wordTracker.setWordsCountPerChunk(1);var stream = wordTracker.nextWordStringStream();预计(溪流，emitsInOrder(List< Word> .generate(6，(i)＝>我>2?Word(''):Word(i.toString()))));对于(int i = 0; i< 6; i ++){wordTracker.nextWord();}}); 

我需要测试作为 String 的成员数据 Word :: content 是否等于 emitsInOrder 中提供的内容./p>

类似于以下内容的流

:

  expect(溪流，emitsInOrder(List< Word> .generate(6，(i)＝>我>2?Word(''):Word(i.toString()))，期望((实际单词数，期望单词数){返回actual.content ==预期内容；})); 

解决方案

阅读dart文件中的源代码并在Internet上阅读后，我找到了解决方案:我需要创建一个自定义Matcher.我在笔记本电脑上测试了以下代码，并通过引用应用程序中的其他文件(如"WordTracker")，代码按预期运行.

  test('单词顺序读取正确'，(){WordTrackerInterface wordTracker = WordTracker.byContent('0 1 2');wordTracker.setWordsCountPerChunk(1);var stream = wordTracker.nextWordStringStream();期望(流，emitsInOrder(List< Word> .generate(6，(i)=> i> 2?Word(''):Word(i.toString())).map< WordMatcher>((字值)=>WordMatcher(value))));for(int i = 0; i< 6; i ++){wordTracker.nextWord();}});WordMatcher类扩展Matcher {预期字词；实际字词；WordMatcher(this.expected);@override说明describe(描述说明){返回description.add(期望的单词内容='$ {expected.content}'"))；}@override说明describeMismatch(动态项目，说明不匹配说明，映射<动态，动态>matchState，布尔冗长){return mismatchDescription.add(具有实际发出的单词内容＝'$ {matchState ['actual'].content}''")；}@override布尔匹配(实际，地图matchState){this.actual =实际；matchState ['actual'] =实际是Word吗?实际的:Word('未知');return(实际为Word).content == Expected.content;}} 

How to test a stream in dart? I have this code:

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();
  }
});

I need to test that the member data Word::content which is a String is equal to that provided in the emitsInOrder.

Something like the following for stream:

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

解决方案

After reading the source code in dart files and reading on the internet, I found the solution: I needed to create a custom Matcher. I tested the following code on my laptop and by referencing other files from my application like 'WordTracker', the code ran as expected.

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())).map<WordMatcher>(
        (Word value) => WordMatcher(value))));

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


class WordMatcher extends Matcher {
  Word expected;
  Word actual;
  WordMatcher(this.expected);

  @override
  Description describe(Description description) {
    return description.add("has expected word content = '${expected.content}'");
  }

  @override
  Description describeMismatch(
    dynamic item,
    Description mismatchDescription,
    Map<dynamic, dynamic> matchState,
    bool verbose
  ) {
    return mismatchDescription.add("has actual emitted word content = '${matchState['actual'].content}'");
  }

  @override
  bool matches(actual, Map matchState) {
    this.actual = actual;
    matchState['actual'] = actual is Word ? actual : Word('unknown');
    return (actual as Word).content == expected.content;
  }
}

这篇关于如何在Dart中测试流的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！