在同一文件中定义的Sinon存根辅助方法 [英] Sinon stubbing helper method defined in same file

问题描述

所以我有一个文件user-database，看起来像这样:

So I have a file, user-database, that looks something like this :

export function foo(id: number): Promise<boolean> {
  return new Promise<boolean>((resolve, reject) => {
    findSomething(id)
    .then((data) => {
      //do something with data
    })
  }
}

export function findSomething(id: number): Promise<Object> {
  return new Promise<Object> ((resolve, reject) => {
    let query = 'SELECT * FROM user';
    db.executeQuery(query);
    .then(data) => {
      if(data.length < 1) { reject(new Error('whoops')); }
      resolve(data);
    }, (err) => {
      reject(err);
    })
  })
}

因此，我正在使用Sinon编写外部函数foo的单元测试，因此我想对它调用的函数findSomething进行存根.我这样做如下:

So I am writing unit tests using Sinon for the exterior function, foo, and therefore I want to stub the function it calls, findSomething. I do this as follows:

import * as user_db from '../../src/user-database';

describe('POST /someEndpoint', () => {
  describe('when successful', () => {
    let stub;

    beforeEach(function() {
      stub = sinon.stub(user_db, 'findSomething');
    });

    afterEach(function() {
      stub.restore();
    }); 

    it('should respond with 200', function(done) {
      stub.returns(anObjectIPredefine);

      request(server)
        .post(basePath)
        .send(aPayloadIPredefine)
        .expect(200, done);
    });
  }
}

运行测试时，我看不到告诉存根随该stub.returns(anObjectIPredefine)返回的对象.实际上，我实际上让函数findSomething正常执行，并从dB中获取数据.有什么明显的地方我做错了吗?我唯一的猜测是stub = sinon.stub(user_db, 'findSomething')不是对与测试功能在相同范围内定义的功能进行存根的正确语法.我找不到什么替代语法.

When I run the test, I don't see the object I am telling the stub to return with this stub.returns(anObjectIPredefine). I instead actually have the function findSomething execute as normal and grab data from the dB. Is there anything obvious I am doing wrong? My only guess is that stub = sinon.stub(user_db, 'findSomething') is not the proper syntax for stubbing a function defined in the same scope as the function being tested. I can't find what an alternative syntax would be though.

推荐答案

所以我最终要做的是将希望存根的函数移动到另一个文件中.完成此操作后，存根将按预期工作.可能不是最好的解决方案，但绝对是对处于类似情况的任何人的快速创可贴.

So what I ended up doing was moving the functions I wished to stub to a different file. When this is done, stubbing works as intended. Probably not the best solution, but definitely a quick band-aid for anyone in a similar situation.

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