Sinon stub axios 抛出错误：TypeError: Attempted to wrap get which has been Wrapped

【问题标题】：Sinon stub axios throws error : TypeError: Attempted to wrap get which is already wrappedSinon stub axios 抛出错误：TypeError: Attempted to wrap get which has been Wrapped
【发布时间】：2020-05-10 17:20:31
【问题描述】：

目前很少有关于堆栈溢出的问题出现此错误，但没有一个问题解释了存根axios 上的此错误。我从 sinonjs.org 获取了样板工作示例，并尝试模拟 axios。它抛出错误

TypeError: Attempted to wrap get which has been Wrapped

代码如下：

import Axios from 'axios';

var sandbox = require('sinon').createSandbox();

describe('axios.get method', function () {
  beforeEach(function () {
    // stub out the `axios` method
    sandbox.stub(Axios, 'get');
  });

  afterEach(function () {
    // completely restore all fakes created through the sandbox
    sandbox.restore();
  });

  it('should be called once', function () {});
});

【问题讨论】：

标签： axios sinon stubbing

【解决方案1】：

您收到此错误的原因是您多次存根Axios.get 方法。您提供的代码工作正常。因此，您需要调用sanbox.restore() 方法来恢复通过沙箱创建的所有伪造品，然后再重新存根该方法。请检查您的代码不会继续存根 Axios.get 方法。

例如

index.test.ts:

import Axios from 'axios';
import sinon from 'sinon';
const sandbox = sinon.createSandbox();

describe('axios.get method', () => {
  let axiosGetStub;
  beforeEach(() => {
    axiosGetStub = sandbox.stub(Axios, 'get');
  });

  afterEach(() => {
    sandbox.restore();
  });

  it('should be called once', () => {
    Axios.get('http://localhost:3000');
    sandbox.assert.calledOnce(axiosGetStub);
  });
  it('should be called once again', () => {
    Axios.get('http://localhost:3000');
    sandbox.assert.calledOnce(axiosGetStub);
  });
});

单元测试结果：

  axios.get method
    ✓ should be called once
    ✓ should be called once again


  2 passing (29ms)

【讨论】：