function DataServiceMock(){
        this.getCustomers =
            jasmine.createSpy('getCustomers').and.callFake(getCustomers);

        this.getOrderHeadersForCustomer =
            jasmine.createSpy('getOrderHeadersForCustomer').and.callFake(getOrderHeadersForCustomer);

        this.ready =  function (onReady){ return (onReady) ? onReady() : undefined;}
    }
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Test the customer controller defined in customer.js

To Test:
- each valid product type can return a products array
- invalid product type returns 'pizza' products
- can generate the right link for a product
- calling vm.go goes to the right view for the product
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