Stub Mongoose find method - node.js

Question

I'm trying to stub the find or exec functions to test the following function:
function getOpenTickets() {
return Ticket.find({})
.populate('assignees', ['fullName', 'firstName', 'email', 'notificationSettings.dailyEmail'])
.populate('property', 'name')
.populate('type', 'title')
.populate({path: 'unit', model: 'Unit', select: 'title'})
.sort('created')
.lean()
.exec();
}
I found several posts about stubbing mongoose methods but none of them worked for me, here is what I have:
it('should test getOpenTickets', async() => {
findStub = sinon.stub(Ticket, 'find');
var result = await utils.__get__('getOpenTickets')();
findStub.restore();
});
But I get:
Cannot read property 'populate' of undefined
so I tried replacing it with a fake object:
var fakeFind = {
args: {
populate: [],
sort: null,
lean: null
},
populate: function (a) {
this.args.populate.push(a)
},
sort: function (a) {
this.args.sort = a;
},
lean: function () {
this.args.lean = true
},
exec: function () {
return Promise.resolve(this.args);
}
}
And
findStub = sinon.stub(Ticket, 'find').callsFake(fakeFind);
And the result is:
TypeError: this.fakeFn.apply is not a function
I've also tried stubbing mongoose.Model, prototype, exec, and some other stuff with no luck.
Any ideas?

Answer 1

Try to use sinon-mongoose https://github.com/underscopeio/sinon-mongoose
Here is an example:
require('sinon');
require('sinon-mongoose');
sinon.mock(Ticket)
.expects('find')
.chain('populate').withArgs(/* args */)
.chain('sort').withArgs('create')
.chain('lean')
.chain('exec')
.resolves('SOME_VALUE');