锡南在打字稿存根 [英] Sinon in typescript stub

问题描述

打字稿中的Sinon无法正确导入子模块..请在下面的代码
中找到以下代码是文件parent.ts

Sinon in typescript not able to import sub module propely ..please find below code The below code is file parent.ts

import submodule from './sub-module'
class Parent {

/**
 * name
 */
public parentmethod() {
   let sub = new submodule();
   let result = sub.submethod();
   return result;
}

}

export default Parent

和名为submodule.ts的子模块代码。

and submodule code named as submodule.ts

class submodule{
public submethod(){

    return "hai submodule"
}

}
export default submodule

和以下单元测试脚本

"use strict";
import chai from 'chai';
import sinon from "sinon";
import submodule from '../src/sub-module'
import  parentmodule from '../src/app'
const expect = chai.expect;
describe("test",function(){
    let stub;
    beforeEach(() => {        
       // stub = sinon.stub(sub ,'saveuser');
     });
    it("test methods",function(){
        stub= sinon.createStubInstance(submodule);
        let parentObj = new parentmodule();
        const user =  parentObj.parentmethod(); 
        expect(stub.submethod.calledOnce).to.be.true;
    })

})

结果表明预期的false为true。意味着submethod不在这里调用。有人可以帮助我哪里出错了

The result is showing that expected false to be true. Means submethod is not calling here .Can any one help me where i went wrong

推荐答案

您应该使用链接缝和代理要求将 ./子模块模块存根。

You should use Link Seams and proxyquire to stub ./sub-module module.

例如，

parent.ts ：

import Submodule from './sub-module';

class Parent {
  public parentmethod() {
    let sub = new Submodule();
    let result = sub.submethod();
    return result;
  }
}

export default Parent;

sub-module.ts ：

class Submodule {
  public submethod() {
    return 'hai submodule';
  }
}
export default Submodule;

parent.test.ts ：

import { expect } from 'chai';
import sinon from 'sinon';
import proxyquire from 'proxyquire';

describe('61798668', () => {
  it('should pass', () => {
    const submoduleStub = {
      submethod: sinon.stub().returns('stubbed data'),
    };
    const SubmoduleStub = sinon.stub().returns(submoduleStub);
    const Parent = proxyquire('./parent', {
      './sub-module': {
        default: SubmoduleStub,
      },
    }).default;
    const parent = new Parent();
    const actual = parent.parentmethod();
    expect(actual).to.be.eq('stubbed data');
    sinon.assert.calledOnce(SubmoduleStub);
    sinon.assert.calledOnce(submoduleStub.submethod);
  });
});

带有覆盖率报告的单元测试结果：

unit test results with coverage report:

  61798668
    ✓ should pass (2797ms)


  1 passing (3s)

---------------|---------|----------|---------|---------|-------------------
File           | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
---------------|---------|----------|---------|---------|-------------------
All files      |   85.71 |      100 |      50 |   85.71 |                   
 parent.ts     |     100 |      100 |     100 |     100 |                   
 sub-module.ts |      50 |      100 |       0 |      50 | 3                 
---------------|---------|----------|---------|---------|-------------------

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