Add test for cart data mutations/estimation call

Author: Timon de Groot

dev/tests/js/jasmine/tests/app/code/Magento/Checkout/frontend/js/model/cart/estimate-service.test.js

@@ -143,5 +143,10 @@ define([
             });
             expect(mocks['Magento_Checkout/js/model/cart/totals-processor/default'].estimateTotals).toHaveBeenCalled();
         });
+
+        it('test subscribe when cart data was changed', function () {
+            mocks['Magento_Customer/js/customer-data'].get('cart')({ data_id: 2 });
+            expect(mocks['Magento_Checkout/js/model/cart/totals-processor/default'].estimateTotals).toHaveBeenCalled();
+        });
     });
 });