如何使用 sinon 、 mocha chai 模拟以下代码的响应

Question

谁能帮我写一个示例测试场景？

storage 是一个库（google 云）最后下面的代码行将 return 我一个由文件名和日期组成的数组。

function abc(){
   const files = [];
   files = await storage.bucket(bucketName).getFiles();
   return files;
}

Answer 1

单元测试解决方案如下：

index.ts:

import { Storage } from "@google-cloud/storage";
const storage = new Storage();

export async function abc() {
  const bucketName = "xxx-dev";
  const files = await storage.bucket(bucketName).getFiles();
  return files;
}

export async function xyz(res) {
  const bucketName = "xxx-dev";
  return storage
    .bucket(bucketName)
    .file(res.fileName)
    .createReadStream();
}

index.spec.ts:

import { abc, xyz } from "./";
import { Storage } from "@google-cloud/storage";
import sinon from "sinon";
import { expect } from "chai";

describe("59373281", () => {
  afterEach(() => {
    sinon.restore();
  });
  it("abc should pass", async () => {
    const getFilesStub = sinon.stub().resolves(["file1", "file2"]);
    const bucketStub = sinon.stub(Storage.prototype, "bucket").callsFake(() => {
      return { getFiles: getFilesStub } as any;
    });
    const actual = await abc();
    expect(actual).to.be.deep.eq(["file1", "file2"]);
    sinon.assert.calledWith(bucketStub, "xxx-dev");
    sinon.assert.calledOnce(getFilesStub);
  });

  it("xyz should pass", async () => {
    const fileStub = sinon.stub().returnsThis();
    const createReadStreamStub = sinon.stub();
    const bucketStub = sinon.stub(Storage.prototype, "bucket").callsFake(() => {
      return {
        file: fileStub,
        createReadStream: createReadStreamStub,
      } as any;
    });
    const mRes = { fileName: "jestjs.pdf" };
    await xyz(mRes);
    sinon.assert.calledWith(bucketStub, "xxx-dev");
    sinon.assert.calledWith(fileStub, "jestjs.pdf");
    sinon.assert.calledOnce(createReadStreamStub);
  });
});

100% 覆盖率的单元测试结果：

  59373281
    ✓ abc should pass
    ✓ xyz should pass


  2 passing (46ms)

---------------|----------|----------|----------|----------|-------------------|
File           |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------|----------|----------|----------|----------|-------------------|
All files      |      100 |      100 |      100 |      100 |                   |
 index.spec.ts |      100 |      100 |      100 |      100 |                   |
 index.ts      |      100 |      100 |      100 |      100 |                   |
---------------|----------|----------|----------|----------|-------------------|

包版本：

"@google-cloud/storage": "^4.1.3",
"sinon": "^7.5.0",
"mocha": "^6.2.2",
"chai": "^4.2.0",

源代码：https://github.com/mrdulin/mocha-chai-sinon-codelab/tree/master/src/Whosebug/59373281

Answer 2

我正在尝试测试以下代码，我想我会合作但仍然出现错误，因为 file.on 不是函数:-(

    function abc(req, res){
       const bucketName = "abc-xyz"
        const fileName = "Sample.json"
        var file = storage.bucket(bucketName).file(fileName);
        const myfile = file.createReadStream();
        var  buffer = '';
        myfile.on('data', function(a) {
          buffer += a;
        }).on('end', function() {
          console.log(buffer)
           res.send(buffer)
        });
 }

如何使用 sinon 、 mocha chai 模拟以下代码的响应

How to mock the response for below code using sinon , mocha chai

mocha.js

sinon

google-cloud-storage

google-cloud-platform

google-cloud-functions