javascript - How to mock variable with SinonMocha in node.js - Stack Overflow

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This is my code: start_end.js

var glb_obj, test={};
var timer = 10;

test.start_pool = function(cb) {
   timer--;
   if(timer < 1) {
     glb_obj = {"close": true}; // setting object
     cb(null, "hello world");    
   } else {
     start_pool(cb);
   }
}

test.end_pool = function(){
  if(glb_obj && glb_obj.close) {
    console.log("closed");
  }
}

module.exports = test;

Testcase:

var sinon = require('sinon');
var start_end = require('./start_end');

describe("start_end", function(){ 
   before(function () {
      cb_spy = sinon.spy();
   });

   afterEach(function () {
    cb_spy.reset();
   });

  it("start_pool()", function(done){
     // how to make timer variable < 1, so that if(timer < 1) will meet
     start_end.start_pool(cb_spy);
     sinon.assert.calledWith(cb_spy, null, "hello world");  

  });
});

how to change the variable timer and glb_obj within the functions using sinon?

This is my code: start_end.js

var glb_obj, test={};
var timer = 10;

test.start_pool = function(cb) {
   timer--;
   if(timer < 1) {
     glb_obj = {"close": true}; // setting object
     cb(null, "hello world");    
   } else {
     start_pool(cb);
   }
}

test.end_pool = function(){
  if(glb_obj && glb_obj.close) {
    console.log("closed");
  }
}

module.exports = test;

Testcase:

var sinon = require('sinon');
var start_end = require('./start_end');

describe("start_end", function(){ 
   before(function () {
      cb_spy = sinon.spy();
   });

   afterEach(function () {
    cb_spy.reset();
   });

  it("start_pool()", function(done){
     // how to make timer variable < 1, so that if(timer < 1) will meet
     start_end.start_pool(cb_spy);
     sinon.assert.calledWith(cb_spy, null, "hello world");  

  });
});

how to change the variable timer and glb_obj within the functions using sinon?

• javascript
• node.js
• mocha.js
• sinon

Share Improve this question Follow asked Oct 31, 2017 at 6:29 Srikanth JeevaSrikanth Jeeva 3,01144 gold badges4242 silver badges6262 bronze badges

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2 Answers 2

Sorted by: Reset to default 5

If someone wants to still stub with Sinon, we can stub the getters method and mock get method of the object tested, and works fine for me

sinon.stub(myObj, 'propertyName').get(() => 'mockedValue');

This is not possible using Sinon as of v4.1.2.

Sinon focuses on testing behaviour through stubbing and mocking - rather than changing internal state.

---

If you want to change the values of the private variables, look into using something like rewire:

https://github./jhnns/rewire

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