物流对账单

packages/domain/src/index.test.ts

@@ -2,6 +2,7 @@ import { describe, expect, it } from 'vitest';
 import {
   calcBenefitAmount,
   calcRedeemSettleAmount,
+  calcLogisticsFeeByBottles,
   validateMinPurchase,
   validateRedeemAmount,
   allocateBenefitCoupons,
@@ -67,6 +68,37 @@ describe('calcRedeemSettleAmount', () => {
   });
 });
 
+describe('calcLogisticsFeeByBottles', () => {
+  const xfx = {
+    baseBottles: 2,
+    baseFee: 6,
+    extraBottleFee: 2,
+    boxBottles: 6,
+    boxFee: 14,
+  };
+
+  it('charges base for 1~2 bottles', () => {
+    expect(calcLogisticsFeeByBottles(1, xfx)).toBe(6);
+    expect(calcLogisticsFeeByBottles(2, xfx)).toBe(6);
+  });
+
+  it('adds extra bottle fee', () => {
+    expect(calcLogisticsFeeByBottles(3, xfx)).toBe(8);
+    expect(calcLogisticsFeeByBottles(5, xfx)).toBe(12);
+  });
+
+  it('uses box fee for full boxes', () => {
+    expect(calcLogisticsFeeByBottles(6, xfx)).toBe(14);
+    expect(calcLogisticsFeeByBottles(12, xfx)).toBe(28);
+  });
+
+  it('combines boxes with remainder ladder', () => {
+    expect(calcLogisticsFeeByBottles(7, xfx)).toBe(20);
+    expect(calcLogisticsFeeByBottles(8, xfx)).toBe(20);
+    expect(calcLogisticsFeeByBottles(9, xfx)).toBe(22);
+  });
+});
+
 describe('allocateBenefitCoupons', () => {
   const coupons = [
     { id: '1', balance: 300, createdAt: 1 },