receive_cds_test.js

        it('sets the price for the new CD', function(){
            const catalogue = new Catalogue(contents=[], new CdFactory());
            const warehouse = new Warehouse(catalogue);
            const batch = {
                cds: [
                    {
                        title: 'Bat Out Of Hell',
                        artist: 'Meatloaf',
                        copies: 10,
                        price: 9.99
                    }
                ]
            }
            warehouse.receive(batch);
            const cd = catalogue.search('Bat Out Of Hell', 'Meatloaf');
            assert.equal(cd.price, 9.99);
        })