Question

我正在尝试对使用redux-saga的react应用程序进行单元测试。以下是我的传奇文件：

// sagas.js
export function* getDataFromServer() {
  try {
    const foo = yield select(fooSelector());
    const bar = yield call(barRequest);

    yield put(actions.SOME_ACTION.request());
    const mainResponse = yield call(
      api.getData,
      bar,
      foo.some_number,
      foo.some_other_number,
    );
  } catch () {
    throw error;
  }
}

下面是我的单元测试用例：

// sagas.test.js
describe("getDataFromServer", () => {
  const generator = getDataFromServer();
  it("should get Data", () => {
    expect(generator.next().value).toEqual(select(fooSelector()));
    expect(generator.next().value).toEqual(call(barRequest));
    expect(generator.next().value).
      toEqual(put(actions.SOME_ACTION.request()));
    expect(generator.next().value).toEqual(
      call(
        api.getData,
        bar,
        foo.some_number,
        foo.some_other_number,
      )
    );
  });
});

但是最后一次给我的错误是“无法读取未定义的属性“ some_number”。这很明显，因为开玩笑实际上并没有在saga单元测试中运行所有效果。但是我想知道有什么办法我可以在上一条语句中传递多个yield的值吗？

expect(generator.next(foo, bar).value).toEqual(
      call(
        api.getData,
        bar,
        foo.some_number,
        foo.some_other_number,
      )
    );

Answer 1

这是回答我问题的article。

我做了这样的事情：

// sagas.test.js

const foo = {
  some_number = "some_number",
  some_other_number = "some_other_number"
};
const bar = "bar";
describe("getDataFromServer", () => {
const generator = getDataFromServer();
it("should get Data", () => {
  expect(generator.next().value).toEqual(select(fooSelector()));
  expect(generator.next(foo).value).toEqual(call(barRequest));
  expect(generator.next(bar).value).
    toEqual(put(actions.SOME_ACTION.request()));
  expect(generator.next().value).toEqual(
    call(
      api.getData,
      bar,
      foo.some_number,
      foo.some_other_number,
    )
    );
  });
});

在JavaScript生成器中传递所有先前收益的值

1 个答案: