stubing S3在节点中上载。js

Question

我将如何在节点中对S3上传进行存根。js？

为了获得洞察力，我使用摩卡进行测试，使用Sinon进行存根，但我愿意改变任何事情。我有一个文件，它导出一个执行上载的函数。看起来是这样的：

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
});

如果我尝试存根AWS。S3或AWS。S3。原型，没有任何变化。我假设这是因为我的测试需要aws sdk本身，并且每个函数都有自己的副本。

我的测试是这样的：

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();
    });
  });
});

这个测试工作正常，但它不会将上传存根到S3，因此上传实际上要经过：X。

Answer 1

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);
    });

Answer 2

你可以用锡农存根。如果您愿意，请按如下所示进行操作：

>

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

});
//Expose S3 instance
exports.s3 = s3;

将同一个实例作为存根，如下所示：

var sinon = require('sinon');
//Import module you are going to test
var UploadService = require('./uploadService');

describe('POST /files', function () {

  before(function() {
    //Stub before, and specify what data you'd like in the callback.
    this.uploadS3Stub = sinon.stub(uploadService.s3, 'upload').callsArgWith(1, null, { data: 'Desired response' });
  });

  after(function() {
    //Restore after
    this.uploadS3Stub.restore();
  });

  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};
    var self = this;

    request.post(params, function (error, response, body) {
      expect(response.statusCode).to.eq(200);
      expect(response.body).to.eq('Uploaded');
      //You can also check whether the stub was called :)
      expect(self.uploadS3Stub.calledOnce).to.eql(true);
      done();
    });
  });
});

Answer 3

在节点中模拟S3有几个选项。

一些特定于S3的模块：

• https://www.npmjs.com/package/mock-s3
• https://www.npmjs.com/package/mock-aws-s3

一些用于一般AWS模拟的模块：

• https://www.npmjs.com/package/aws-sdk-mock
• https://www.npmjs.com/package/mock-aws-sinon
• https://www.npmjs.com/package/mock-aws

您甚至可以启动一个简单的服务器来响应一些S3 API调用：

• https://www.npmjs.com/package/s3rver

最后一个可以很容易地在其他语言和运行时使用，而不仅仅是在节点中。