circular references and .spy cause RangeError: Maximum call stack size exceeded

breaking-buster-sinon-spy.js

buster.testCase('breaking call stack when using circular references and spies', {

    setUp: function() {

        var A = function() {
            this.collections = [];
        }, B = function() {
            this.models = [];
            this.add = function(what) {
                what.collections.push(this);
                this.models.push(what)
            };
        };


        this.model = new A();
        this.collection = new B();
    },

    'Expect a model.collections to receive the collection it is a member of': function() {
        var spy = this.spy();

        this.collection.add(this.model);
        Array.forEach(this.model.collections, spy);
        buster.assert.calledWith(spy, this.collection);
    }

});

I know this is an anti-pattern as such, got it from another MV* which tries to decorate models with all the collections that contain the model but they contain the model... anyway.

using this same code w/o a spy can pass any test you like, eg:

this.collection.add(this.model);
buster.assert.equals(this.collection, this.model.collections[0]);

• which still means there may be something not right with the spy func.