Angular Karma单元测试等待Isempty发出价值

发布于 2025-01-31 12:10:43 字数 716 浏览 3 评论 0 原文

我有以下用于处理错误的代码：

              catchError((error) => {
                return statement ? EMPTY : otherValue;
              }),

我正在尝试为此编写一个单元测试。在这里我取得了成就。

  it('test description', fakeAsync(() => {
    let saved: boolean;
    action = new action({ data: 'some data'});
    action$.next(action);

    effects.save.pipe(isEmpty()).subscribe((data: boolean) => {
      console.log('data:', data);
      saved = data;
    });
    flush();

    console.log('saved:', saved);
    expect(saved).toBeTrue();
  }));

我的输出看起来像：

```
'saved:', undefined
'data:', true
Error: Expected undefined to be true.
```

如何改进这次测试？

原文

I have following code for handling errors:

              catchError((error) => {
                return statement ? EMPTY : otherValue;
              }),

I am trying to write an unit test for this. Here what I have achieved.

  it('test description', fakeAsync(() => {
    let saved: boolean;
    action = new action({ data: 'some data'});
    action$.next(action);

    effects.save.pipe(isEmpty()).subscribe((data: boolean) => {
      console.log('data:', data);
      saved = data;
    });
    flush();

    console.log('saved:', saved);
    expect(saved).toBeTrue();
  }));

My output looks like:

```
'saved:', undefined
'data:', true
Error: Expected undefined to be true.
```

What can I improve to make this test pass?

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给不了的爱 2025-02-07 12:10:43

您正在尝试同步访问异步值。您应该在异步处理程序内使用完成的函数（内部 subscribe（））。

it('test description', done => {
  action = new action({ data: 'some data'});
  action$.next(action);

  effects.save.pipe(isEmpty()).subscribe((data: boolean) => {
    console.log('data:', data);
    expect(data).toBeTrue();
    done();
  });
});

You're trying to synchronously access asynchronous value. You should use a done function inside the async handler (inside subscribe()).

it('test description', done => {
  action = new action({ data: 'some data'});
  action$.next(action);

  effects.save.pipe(isEmpty()).subscribe((data: boolean) => {
    console.log('data:', data);
    expect(data).toBeTrue();
    done();
  });
});

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