在Node.js中存根S3上传 [英] Stubbing S3 uploads in Node.js

问题描述

我该如何在Node.js中存根S3上传?

How would I go about stubbing S3 uploads in Node.js?

为了获得见识，我正在使用Mocha进行测试，并使用Sinon进行存根，但是我愿意改变任何东西.我有一个导出执行上传功能的文件.看起来像这样:

For insight, I'm using Mocha for tests and Sinon for stubbing, but I'm open to changing anything. I have a file that exports a function that performs the upload. It looks like this:

var AWS = require('aws-sdk');
var s3 = new AWS.S3({ params: { Bucket: process.env.S3_BUCKET }});
var params = { Key: key, Body: body };
s3.upload(params, function (error, data) {
  // Handle upload or error
});

如果我尝试对 AWS.S3 或 AWS.S3.prototype 进行存根，则没有任何变化.我认为这是因为我的测试本身需要 aws-sdk ，并且每个函数都有自己的副本.

If I try to stub AWS.S3 or AWS.S3.prototype, nothing changes. I assume this is because my tests have required aws-sdk themselves and have their own copy of each function.

我的测试如下:

describe('POST /files', function () {
  var url = baseURL + '/files';
  it('uploads the file to s3', function (done) {
    var fs = require('fs');
    var formData = {
      video: fs.createReadStream(process.cwd() + '/test/support/video.mp4')
    };
    var params = {url: url, formData: formData};
    request.post(params, function (error, response, body) {
      expect(response.statusCode).to.eq(200);
      expect(response.body).to.eq('Uploaded');
      done();
    });
  });
});

此测试工作正常，但不会对上传到S3的存根进行存根，因此上传实际上是通过:X进行的.

This test works fine, but it does not stub the upload to S3, so the upload actually goes through :X.

推荐答案

s3UploadStub = AWS.S3.prototype.upload = sandbox.stub();



 it("should  upload  successfully", async function() {
        s3UploadStub.yields(null, data);
        let response = await FileUtil.uploadFile(fileReference,data);
        expect(s3UploadStub.calledOnce).to.be.true;
        expect(response.statusCode).to.equal(200);
        expect(response.body).to.equal(fileReference);
    });

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