Jest说TypeError：（0，className.functionName）不是函数

Question

我有一个JS文件如下

import axios from "axios";

export default class SomeService {

  static getSomething(id) {
    return axios
        .get(API_BASE_URL + API_URL_Something, {
        params: { id: id},
      })
      .then((result) => {
        return result.data;
      })
      .catch((error) => {
        throw error;
      });
  }
}

，并且有一个test.js使用开玩笑如下，

import axios from "axios";

import { getSomething } from "../SomeService.js";

jest.mock("axios");

describe("getSomething", () => {
    describe("when API call is successful", () => {
        it("should return some details", () => {
            // given
            const someDetails = [
                { id: 1, name: "Something 1" },
                { id: 2, name: "Something 2" },
            ];
            axios.get.mockResolvedValueOnce(someDetails);
            // when
            const result = getSomething(123); // ERROR THROWN HERE

            // then
            let url = API_BASE_URL + Constants.API_URL_Something;
            expect(axios.get).toHaveBeenCalledWith(`${url}`);
            expect(result).toEqual(someDetails);
        });
    });

    describe("when API call fails", () => {
        it("should return empty entity details", () => {
            // ...
        });
    });
});

但是当我运行NPM测试时，我会收到此错误，

TypeError: (0 , _SomeService.getSomething) is not a function

我尝试过将功能不静态（我不必），尝试将其导出（cann也许是正确的），但不能使它变得非常努力。其他类似的帖子也不能解决我的问题。我在做什么错？

Answer 1

根据我在代码中看到的内容，您正在导出类someService，而不是其内部getsomething方法。因此，您肯定需要将测试代码更改为以下内容：

import axios from "axios";

import { getSomething } from "../SomeService.js";

jest.mock("axios");

describe("getSomething", () => {
    describe("when API call is successful", () => {
        it("should return some details", () => {
            //...
            // when
            const service = new SomeService();
            const result = service.getSomething(123);

            // ...