ExpectSaga put 断言因多个 put 效果而失败

Question

传奇有多个放置。

export function* changeItemsSaga(action) {
    const prerequisite1 = yield select(prerequisite1Selector);

    // some processing

    yield put(actions.myAction1(payload1));

    // some more processing

    const prerequisite2 = yield select(prerequisite2Selector);

    // some more processing

    yield put(actions.myAction2(payload2));
}

当 saga 返回多重效果时，我该如何写我的看跌预期？

it('should update items', () =>
    expectSaga(sagas.changeItemsSaga, action)
        .provide([
            [select(prerequisite1), {}],
            [select(prerequisite2), {}],
        ])
        .put([actions.myAction1(payload1), actions.myAction2(payload2)])
        .run());

ExpectSaga单元测试returns出现如下错误：

Saga test error:
put expectation unmet:

Expected
--------
{ channel: null,
  action:
   [ { type: 'MY_ACTION_1',
       payload: { myItem1: [Object] } },
     { type: 'MY_ACTION_2',
       payload: { itemCollection: [Object] } } ] }

Actual:
------
1. { channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }
2. { channel: null,
  action:
   { type: 'MY_ACTION_2',
     payload: { itemCollection: [ [Object] ] } } }

这个也不行。

it('should update items', () =>
    expectSaga(sagas.changeItemsSaga, action)
        .provide([
            [select(prerequisite1), {}],
            [select(prerequisite2), {}],
        ])
        .put(actions.myAction1(payload1))
        .put(actions.myAction2(payload2))
        .run());

是returns这个错误。

Saga test error:
put expectation unmet:

Expected
--------
{ channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }

Actual:
------
1. { channel: null,
  action:
   { type: 'MY_ACTION_1',
     payload:
      { myItem1:
         { index: 0,
           childItem1: [Object],
           childItem2: [Object] } } } }
2. { channel: null,
  action:
   { type: 'MY_ACTION_2',
     payload: { itemCollection: [ [Object] ] } } }

Answer 1

provide 语法允许您测试 saga 的最终效果，而不是引导所有状态。

这是来自 redux-saga docs -

的示例

test('test only final effect with .provide()', () => {
  /*
  * With the .provide() method from expectSaga
  * you can by pass in all expected values
  * and test only your saga's final effect.
  */
  return expectSaga(callApi, 'url')
    .provide([
      [select(selectFromState), selectedValue],
      [call(myApi, 'url', selectedValue), response]
    ])
    .put(success(response))
    .run();
});

通过调用actions调用2x，连续测试运行，有效跳过sagas.changeItemsSaga中间的put[=17] =]

看起来您可能要使用的函数是 testSaga，它将让您更细致地了解效果流。

ExpectSaga put 断言因多个 put 效果而失败

ExpectSaga put assertion failes with multiple put effects

reactjs

redux

redux-saga

redux-saga-test-plan