redux-saga-test-plan失败，使用确切的预期和实际断言

Question

我有一个POST到我的API的createPostSaga，我正在尝试对其进行测试。这是传奇：

export function* createPostSaga(action) {
  const token = yield select(selectToken);
  const headerParams = {
    Authorization: `JWT ${token}`
  };
  const apiCall = () => {
    let formData = new FormData();
    formData.append("title", action.payload.title);
    formData.append("content", action.payload.content);
    formData.append("thumbnail", action.payload.thumbnail);
    formData.append("tags", JSON.stringify(action.payload.tags));
    formData.append("slug", generateSlug(action.payload.title));
    return axios({
      method: "post",
      url: "/posts/",
      data: formData,
      headers: headerParams
    })
      .then(response => response.data)
      .catch(err => {
        throw err;
      });
  };

  try {
    const response = yield call(apiCall);
    yield put(push(`/posts/${response.id}/${response.slug}/`));
  } catch (error) {
    console.log(error);
  }
}

这是我到目前为止失败的代码：

describe("createPostSaga", () => {
    const action = {
      type: types.CREATE_POST,
      payload: {
        title: "test title",
        pub_date: "2018-11-12",
        content: "test content",
        tags: ["test1", "test2"],
        thumbnail: "http://fail",
        slug: "test-title"
      }
    }

    const apiCall = () => ({
      id: 1,
      ...action.payload  
    });

    it("calls the api and redirects", () => {
      testSaga(actions.createPostSaga, action)
        .next()
        .select(selectToken)
        .next()
        .call(apiCall)
        .next()
        .put(push("/posts/1/test-title/"))
        .finish()
        .isDone();
    })
  })

测试此代码时，出现以下错误：

SagaTestError:
    Assertion 2 failed: call effects do not match

    Expected
    --------
    { context: null, fn: [Function: apiCall], args: [] }

    Actual
    ------
    { context: null, fn: [Function: apiCall], args: [] }

如您所见，预期结果与实际结果相同。

我还试图将apiCall函数直接复制粘贴到我的测试中，但是它失败，并显示相同的消息，我很困惑。