在nock获取请求中未定义主机名

Question

我正在尝试为发出get请求的功能编写基本的单元测试，并以降序/升序对用户业力点进行排序。我正在使用nock模拟http响应，但继续遇到错误，提示主机名未定义。

我仔细阅读了nock文档，以确认我正确地调用了主机名https://github.com/nock/nock#specifying-hostname，并跟随了youtube视频https://www.youtube.com/watch?v=3G_yyE5GeIk来帮助我弄清楚如何在单元测试中使用nock。但是我仍然不明白为什么它是不确定的。

我正在测试的原始功能

let axios = require("axios");
let atob = require('atob');

let KARMABOT_API_ENDPOINT = process.env.KARMABOT_API_ENDPOINT;


module.exports = {
getSorted: async function (direction) {
        if (direction !== "ASC" && direction !== "DESC") {
            console.error("INVALID SORTING DIRECTION: %s. PLEASE PROVIDE ASC OR DESC", direction);
            return;
        }
        try {
            let url = `http://${KARMABOT_API_ENDPOINT}/getsorted/${direction}`;
            console.log('endpoint is:', KARMABOT_API_ENDPOINT)
            console.log('URL IS:', url)
            let jsonResult = await axios.get(url);
            let sorted = { users: [], karmas: [] };
            jsonResult.data.forEach(element => {
                //users are stored in the database encoded, atob() decodes them back into strings
                sorted.users.push(atob(element[0]));
                sorted.karmas.push(element[1]);
            });
            return sorted
        } catch (error) {
            console.error('ERROR HERE', error)
        }
    }
} //end module.exports

单元测试代码：

const assert = require('chai').assert;
const getSorted = require('../src/karma').getSorted;
const nock = require('nock');


let karmaApi = nock('http://server:4567');

describe('Sorting', function () {
    it('should return karma in DESC order', function (done) {
        let expectedKarmas = { users: ['nikki', 'person', 'nolan'], karmas: ['3', '2', '1'] }

        karmaApi.get('/getsorted/DESC')
            .reply(200,
                [['bmlra2k=', '3'], ['cGVyc29u', '2'], ['bm9sYW4=', '1']]
            );

        let recievedKarmas = getSorted("DESC");
        console.log('recievedKarmas:::', recievedKarmas)
        assert.equal(recievedKarmas, expectedKarmas);
    });
});

完全错误：

  Sorting
endpoint is: undefined
URL IS: http://undefined/getsorted/DESC
recievedKarmas::: Promise { <pending> }
    1) should return karma in DESC order
ERROR HERE { Error: getaddrinfo ENOTFOUND undefined undefined:80
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:56:26)
  errno: 'ENOTFOUND',
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'undefined',
  host: 'undefined',
  port: 80,
  config:
   { url: 'http://undefined/getsorted/DESC',
     method: 'get',
     headers:
      { Accept: 'application/json, text/plain, */*',
        'User-Agent': 'axios/0.19.0' },
     transformRequest: [ [Function: transformRequest] ],
     transformResponse: [ [Function: transformResponse] ],
     timeout: 0,
     adapter: [Function: httpAdapter],
     xsrfCookieName: 'XSRF-TOKEN',
     xsrfHeaderName: 'X-XSRF-TOKEN',
     maxContentLength: -1,
     validateStatus: [Function: validateStatus],
     data: undefined },
  request:
   Writable {
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        finalCalled: false,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        destroyed: false,
        decodeStrings: true,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: true,
        bufferProcessing: false,
        onwrite: [Function: bound onwrite],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 0,
        prefinished: false,
        errorEmitted: false,
        emitClose: true,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     _events:
      [Object: null prototype] {
        response: [Function: handleResponse],
        error: [Function: handleRequestError] },
     _eventsCount: 2,
     _maxListeners: undefined,
     _options:
      { protocol: 'http:',
        maxRedirects: 21,
        maxBodyLength: 10485760,
        path: '/getsorted/DESC',
        method: 'GET',
        headers: [Object],
        agent: undefined,
        auth: undefined,
        hostname: 'undefined',
        port: 80,
        nativeProtocols: [Object],
        pathname: '/getsorted/DESC',
        proto: 'http',
        host: 'undefined:80' },
     _redirectCount: 0,
     _redirects: [],
     _requestBodyLength: 0,
     _requestBodyBuffers: [],
     _onNativeResponse: [Function],
     _currentRequest:
      ClientRequest {
        _events: [Object],
        _eventsCount: 6,
        _maxListeners: undefined,
        output: [],
        outputEncodings: [],
        outputCallbacks: [],
        outputSize: 0,
        writable: true,
        _last: true,
        chunkedEncoding: false,
        shouldKeepAlive: false,
        useChunkedEncodingByDefault: false,
        sendDate: false,
        _removedConnection: false,
        _removedContLen: false,
        _removedTE: false,
        _contentLength: 0,
        _hasBody: true,
        _trailer: '',
        finished: true,
        _headerSent: true,
        socket: [Socket],
        connection: [Socket],
        _header:
         'GET /getsorted/DESC HTTP/1.1\r\nAccept: application/json, text/plain, */*\r\nUser-Agent: axios/0.19.0\r\nHost: undefined\r\nConnection: close\r\n\r\n',
        _onPendingData: [Function: noopPendingOutput],
        agent: [Agent],
        socketPath: undefined,
        timeout: undefined,
        method: 'GET',
        path: '/getsorted/DESC',
        _ended: false,
        res: null,
        aborted: undefined,
        timeoutCb: null,
        upgradeOrConnect: false,
        parser: null,
        maxHeadersCount: null,
        _redirectable: [Circular],
        [Symbol(isCorked)]: false,
        [Symbol(outHeadersKey)]: [Object] },
     _currentUrl: 'http://undefined:80/getsorted/DESC' },
  response: undefined,
  isAxiosError: true,
  toJSON: [Function] }


  0 passing (23ms)
  1 failing

  1) Sorting
       should return karma in DESC order:
     AssertionError: expected {} to equal { Object (users, karmas) }
      at Context.<anonymous> (test/test-karma.js:19:16)



npm ERR! Test failed.  See above for more details.

我知道我至少要达到原始功能，因为ERROR HERE被记录下来了。但是当我从测试中调用主机名时，我看不到如何定义主机名，但是当我运行脚本时，它可以很好地工作。