Sinon stub throwing Attempted to wrap object which is already wrapped

Question

Although there are posts regarding this , I could not fix it using before, after functions and restoring the objects. Posting the code below:-

var Log = sinon.stub(hello, 'someEvent', function(type, name){
        var obj = {};
        obj.addData = function(data){
            return;
        };
        obj.complete = function(){
            return;
        }
        return obj;
     }),
    someVar = sinon.stub(servicecore, 'some'),

The error I get is:-

Attempted to wrap someEvent which is already wrapped.

And

Attempted to wrap some which is already wrapped.

Can someone help with this?

Edited below

I even tried with before and after functions as suggested:-

var Log,someVar;

before(function(){

   Log = sinon.stub(hello, 'someEvent', function(type, name){
            var obj = {};
            obj.addData = function(data){
                return;
            };
            obj.complete = function(){
                return;
            }
            return obj;
         });
    someVar = sinon.stub(servicecore, 'some');

});

after(function(){

    Log.restore();
    someVar.restore();
});

Tried even with beforeEach and afterEach functions but same error.

Answer 1

From the sinon documentation:

var stub = sinon.stub(object, "method"); Replaces object.method with a stub function. The original function can be restored by calling object.method.restore(); (or stub.restore();). An exception is thrown if the property is not already a function, to help avoid typos when stubbing methods.

The stub is normally restored after the test is complete using the after or afterEach hooks.

  after(function() {
    // runs before all tests in this block
    someVar.restore();
  });

  afterEach(function() {
    // runs before each test in this block
    someVar.restore();
  });

Answer 2

you are stubbing someVar.some not someVar itself so you need to restore its method:

    someVar.some.restore();

If you still have problems, then try to stub using the following method.

    someVar.some = sinon.stub();

Looks like the same but it is not :) (discovered after hours of swearing)

Anyway let's try the sandbox in sinon to stub from it and just restore the sandbox at the end

https://sinonjs.org/releases/v1.17.7/sandbox/