Keep track of couponDiscount and memberDiscount on item prices

Author: biilmann

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gocommerce-js",
-  "version": "3.8.0",
+  "version": "3.8.1",
   "description": "GoCommerce API client for JavaScript",
   "main": "lib/index.js",
   "files": [

src/calculator.js

@@ -99,14 +99,17 @@ export function calculatePrices(settings, claims, country, currency, coupon, ite
       itemPrice.discount = calculateDiscount(
         itemPrice.subtotal, itemPrice.taxes, coupon.percentage, fixedAmount(coupon.fixed, currency), includeTaxes
       );
+      itemPrice.couponDiscount = itemPrice.discount;
     }
     if (settings && settings.member_discounts) {
       settings.member_discounts.forEach((discount) => {
         if (couponValidFor(claims, discount, item)) {
-          itemPrice.discount = itemPrice.discount || 0;
-          itemPrice.discount += calculateDiscount(
+          const memberDiscount = calculateDiscount(
             itemPrice.subtotal, itemPrice.taxes, discount.percentage, fixedAmount(discount.fixed, currency), includeTaxes
           );
+          itemPrice.discount = itemPrice.discount || 0;
+          itemPrice.discount += memberDiscount;
+          itemPrice.memberDiscount = memberDiscount;
         }
       });
     }

src/calculator.test.js

@@ -29,6 +29,17 @@ test('fixed vat when prices include taxes', () => {
   expect(price.total).toBe(100);
 });
 
+test('fixed vat when prices include taxes for a real example', () => {
+  const price = calculatePrices({
+    taxes: [{percentage: 7, product_types: ["book"], countries: ["Netherlands"]}],
+    prices_include_taxes: true
+  }, null, "Netherlands", "EUR", null, [{price: {cents: 2900}, type: "book"}]);
+  expect(price.subtotal).toBe(2710);
+  expect(price.taxes).toBe(190);
+  expect(price.discount).toBe(0);
+  expect(price.total).toBe(2900);
+});
+
 test('country based VAT', () => {
   const settings = {taxes: [{percentage: 21, product_types: ["test"], countries: ["USA"]}]};
   const price = calculatePrices(settings, null, "USA", "USD", null, [{price: {cents: 100}, type: "test"}]);