我正在尝试对我正在处理的应用进行单元测试,而且我遇到了一个使用axios发出AJAX请求的功能。这是我为它编写的模拟函数(注意:MockPBufData.txt文件是一个使用协议缓冲区序列化的文件,我从datamine.mta.info下载。可能下载该文件搞砸了它格式化并导致此错误?):
var GtfsRealtimeBindings = require('gtfs-realtime-bindings');
var axios = require('axios');
function RequestMock () {
axios.get('./MockPBufData.txt')
.then(function (body) {
var feedData = body.data;
var feed = GtfsRealtimeBindings.FeedMessage.decode(feedData);
return { feed: feed };
}).catch(error => console.log(error));
}
export default RequestMock;
这里的测试失败了(我期待的属性出现在你在datamine.mta.info上找到的每个反序列化文件中):
import React from 'react';
import RequestMock from '../mocks/RequestMock';
it('makes decoded data accessible from RequestMock.feed', () => {
expect(RequestMock.feed).toHaveProperty('header.gtfs_realtime_version', '1.0');
});
最后,这里是Jest错误以及来自控制台的堆栈跟踪:
expect(object)[.not].toHaveProperty(path, value)
Expected object to be an object. Received:
undefined: undefined
at Object.<anonymous>.it (src/tests/api.test.js:12:37)
at Promise.resolve.then.el (node_modules/p-map/index.js:42:16)
at process._tickCallback (internal/process/next_tick.js:109:7)
{ Error: Network Error
at createError (/Users/Ben/React/subway-checker/node_modules/axios/lib/core/createError.js:16:15)
at XMLHttpRequest.handleError [as onerror] (/Users/Ben/React/subway-checker/node_modules/axios/lib/adapters/xhr.js:87:14)
at XMLHttpRequest.callback.(anonymous function) (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:289:32)
at invokeEventListeners (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:219:27)
at invokeInlineListeners (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:166:7)
at EventTargetImpl._dispatch (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:122:7)
at EventTargetImpl.dispatchEvent (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/events/EventTarget-impl.js:87:17)
at XMLHttpRequest.dispatchEvent (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/generated/EventTarget.js:61:35)
at XMLHttpRequest.abort (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/xmlhttprequest.js:405:16)
at Object.abort (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/xhr-utils.js:315:13)
at RequestManager.close (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/living/nodes/Document-impl.js:146:21)
at Window.close (/Users/Ben/React/subway-checker/node_modules/jsdom/lib/jsdom/browser/Window.js:362:29)
at JSDOMEnvironment.dispose (/Users/Ben/React/subway-checker/node_modules/jest-environment-jsdom/build/index.js:44:19)
at Promise.resolve.then (/Users/Ben/React/subway-checker/node_modules/jest/node_modules/jest-cli/build/runTest.js:102:17)
at process._tickCallback (internal/process/next_tick.js:109:7)
config:
{ adapter: [Function: xhrAdapter],
transformRequest: { '0': [Function: transformRequest] },
transformResponse: { '0': [Function: transformResponse] },
timeout: 0,
xsrfCookieName: 'XSRF-TOKEN',
xsrfHeaderName: 'X-XSRF-TOKEN',
maxContentLength: -1,
validateStatus: [Function: validateStatus],
headers: { Accept: 'application/json, text/plain, */*' },
method: 'get',
url: './MockPBufData.txt',
data: undefined },
request:
XMLHttpRequest {
onabort: null,
onerror: [Function: handleError],
onload: null,
onloadend: null,
onloadstart: null,
onprogress: null,
ontimeout: [Function: handleTimeout],
upload:
XMLHttpRequestUpload {
onabort: null,
onerror: null,
onload: null,
onloadend: null,
onloadstart: null,
onprogress: null,
ontimeout: null,
_ownerDocument: [Object] },
onreadystatechange: [Function: handleLoad] },
response: undefined }
答案 0 :(得分:0)
您无法访问函数的内部变量(RequestMock.feed
)...该函数实际返回它,因此您只需要以下内容:
expect(RequestMock()).toHaveProperty('header.gtfs_realtime_version', '1.0');