使用Chakram和NodeJS上传文件时出现“结束后写入”错误

Question

我用Chakram (它基于Mocha)和NodeJS测试API。下面是测试代码(我测试一个获取文件和一些数据的WebService，然后将其上传到FTP服务器)：

let chakram = require('chakram'),
    expect = chakram.expect,
    wait = chakram.wait;
let fs = require('fs')
let path = require("path");
let g = require('./lib/globals.js'); /* I define some globals, like g.portfolioUrl: the WebService url I'll test  */
let assert = require('assert');

...

it("should put a file in root folder", function () {
        let $body = {
            action: 'putFile',
            parentPath: '/',
            filenameToStore: 'sample_picture.png'
        };
        /* "options['headers']" is already defined and a "before" step adds authentication cookie */
        options['headers']['Content-Type'] = 'multipart/form-data; charset=utf-8; boundary='
            + Math.random().toString().substr(2);
        options['formData'] = {
            pkgFile: fs.createReadStream(path.resolve(__dirname, '../test/res/sample_picture.png'))
        };
        return chakram.post(g.portfolioUrl, $body, options).then(function (response) {
            expect(response).to.have.status(200);
            return response;
        });
    });

我得到这个错误(似乎与fs.createReadStream有关)：

Error:
write after end
    at write_ (_http_outgoing.js:635:15)
    at ClientRequest.write (_http_outgoing.js:630:10)
    at Request.write (D:\wamp64\www\***\test\***\node_modules\request\request.js:1514:27)
    at FormData.ondata (internal/streams/legacy.js:16:26)
    at emitOne (events.js:115:13)
    at FormData.emit (events.js:210:7)
    at FormData.CombinedStream.write (D:\wamp64\www\***\test\***\node_modules\combined-stream\lib\combined_stream.js:118:8)
    at DelayedStream.ondata (internal/streams/legacy.js:16:26)
    at emitOne (events.js:115:13)
    at DelayedStream.emit (events.js:210:7)
    at DelayedStream._handleEmit (D:\wamp64\www\***\test\***\node_modules\delayed-stream\lib\delayed_stream.js:82:15)
    at ReadStream.source.emit (D:\wamp64\www\***\test\***\node_modules\delayed-stream\lib\delayed_stream.js:29:19)
    at addChunk (_stream_readable.js:252:12)
    at readableAddChunk (_stream_readable.js:239:11)
    at ReadStream.Readable.push (_stream_readable.js:197:10)
    at onread (fs.js:2004:12)
    at FSReqWrap.wrapper [as oncomplete] (fs.js:663:17) {stack: Error: write after end
    at write_ (_http_outgoi… FSReqWrap.wrapper [as oncomplete] (fs.js:663:17),
message: write after end}

已在使用NodeJS 6.11.0和8.1.3的Windows10上进行测试。

我用Mocha找到了一些可能的解决方案(参见How to unit test with a file upload in mocha)，但我不知道如何使其适用于Chakram。

Answer 1

Chakram包含一个等待请求完成的方法。

https://github.com/dareid/chakram#waiting

你可以这样尝试：

const response = chakram.post(g.portfolioUrl, $body, options);
expect(response).to.have.status(200);
return wait();