Stubbing a Mongoose model with Sinon

Question

Stubbing a Mongoose model with Sinon

I want to create a stub for the Mongoose save method in a particular model, so that any instance of my model I create will call the stub instead of the normal Mongoose save method. My understanding is that the only way to do this is to stub the entire model like this:

var stub = sinon.stub(myModel.prototype);

Unfortunately, this line of code throws the following error:

TypeError: Cannot read property 'states' of undefined

Does anyone know what is going wrong here?

node.js
mongoose
sinon

Answer 1

There are two ways to accomplish this. The first is

var mongoose = require('mongoose');
var myStub = sinon.stub(mongoose.Model, METHODNAME);

If you console log mongoose.Model you will see the methods available to the model (notably this does not include lte option).

The other (model specific) way is

var myStub = sinon.stub(YOURMODEL.prototype.base.Model, 'METHODNAME');

Again, the same methods are available to stub.

EDIT: Some methods such as save are stubbed as follows:

var myStub = sinon.stub(mongoose.Model.prototype, METHODNAME);
var myStub = sinon.stub(YOURMODEL.prototype, METHODNAME);

Answer 2

Instead of the whole object, try:

sinon.stub(YOURMODEL.prototype, 'save')

Make sure YOURMODEL is the class not the instance.