如何使用 sinon 、 mocha chai 模拟以下代码的响应

Question

谁能帮我编写一个示例测试场景？

storage是一个库（谷歌云）最终在代码行下方将返回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

这是单元测试解决方案：

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index.ts:

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import { Storage } from "@google-cloud/storage";\nconst storage = new Storage();\n\nexport async function abc() {\n  const bucketName = "xxx-dev";\n  const files = await storage.bucket(bucketName).getFiles();\n  return files;\n}\n\nexport async function xyz(res) {\n  const bucketName = "xxx-dev";\n  return storage\n    .bucket(bucketName)\n    .file(res.fileName)\n    .createReadStream();\n}\n

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index.spec.ts:

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import { abc, xyz } from "./";\nimport { Storage } from "@google-cloud/storage";\nimport sinon from "sinon";\nimport { expect } from "chai";\n\ndescribe("59373281", () => {\n  afterEach(() => {\n    sinon.restore();\n  });\n  it("abc should pass", async () => {\n    const getFilesStub = sinon.stub().resolves(["file1", "file2"]);\n    const bucketStub = sinon.stub(Storage.prototype, "bucket").callsFake(() => {\n      return { getFiles: getFilesStub } as any;\n    });\n    const actual = await abc();\n    expect(actual).to.be.deep.eq(["file1", "file2"]);\n    sinon.assert.calledWith(bucketStub, "xxx-dev");\n    sinon.assert.calledOnce(getFilesStub);\n  });\n\n  it("xyz should pass", async () => {\n    const fileStub = sinon.stub().returnsThis();\n    const createReadStreamStub = sinon.stub();\n    const bucketStub = sinon.stub(Storage.prototype, "bucket").callsFake(() => {\n      return {\n        file: fileStub,\n        createReadStream: createReadStreamStub,\n      } as any;\n    });\n    const mRes = { fileName: "jestjs.pdf" };\n    await xyz(mRes);\n    sinon.assert.calledWith(bucketStub, "xxx-dev");\n    sinon.assert.calledWith(fileStub, "jestjs.pdf");\n    sinon.assert.calledOnce(createReadStreamStub);\n  });\n});\n

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100%覆盖率的单元测试结果：

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  59373281\n    \xe2\x9c\x93 abc should pass\n    \xe2\x9c\x93 xyz should pass\n\n\n  2 passing (46ms)\n\n---------------|----------|----------|----------|----------|-------------------|\nFile           |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |\n---------------|----------|----------|----------|----------|-------------------|\nAll files      |      100 |      100 |      100 |      100 |                   |\n index.spec.ts |      100 |      100 |      100 |      100 |                   |\n index.ts      |      100 |      100 |      100 |      100 |                   |\n---------------|----------|----------|----------|----------|-------------------|\n

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软件包版本：

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

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

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