init

packages/domain/src/index.test.ts

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+import { describe, expect, it } from 'vitest';
+import {
+  calcBenefitAmount,
+  calcRedeemSettleAmount,
+  validateMinPurchase,
+  validateRedeemAmount,
+  allocateBenefitCoupons,
+  calcBenefitSummary,
+} from './index';
+
+describe('calcBenefitAmount', () => {
+  it('uses benefitAmount when set', () => {
+    expect(calcBenefitAmount({ price: 599, benefitAmount: 200 })).toBe(200);
+  });
+
+  it('falls back to price', () => {
+    expect(calcBenefitAmount({ price: 599 })).toBe(599);
+  });
+});
+
+describe('validateMinPurchase', () => {
+  it('local requires 2 bottles', () => {
+    expect(validateMinPurchase('LOCAL', 1, 2, 6).ok).toBe(false);
+    expect(validateMinPurchase('LOCAL', 2, 2, 6).ok).toBe(true);
+  });
+
+  it('cross city requires 6 bottles', () => {
+    expect(validateMinPurchase('CROSS_CITY', 5, 2, 6).ok).toBe(false);
+    expect(validateMinPurchase('CROSS_CITY', 6, 2, 6).ok).toBe(true);
+  });
+});
+
+describe('validateRedeemAmount', () => {
+  it('rejects over balance or 500', () => {
+    expect(validateRedeemAmount(100, 50).ok).toBe(true);
+    expect(validateRedeemAmount(100, 501).ok).toBe(false);
+    expect(validateRedeemAmount(50, 60).ok).toBe(false);
+    expect(validateRedeemAmount(100, 0).ok).toBe(false);
+  });
+});
+
+describe('calcRedeemSettleAmount', () => {
+  it('applies settlement rate', () => {
+    expect(calcRedeemSettleAmount(100, 0.6)).toBe(60);
+  });
+});
+
+describe('allocateBenefitCoupons', () => {
+  const coupons = [
+    { id: '1', balance: 300, createdAt: 1 },
+    { id: '2', balance: 400, createdAt: 2 },
+  ];
+
+  it('allocates FIFO across coupons', () => {
+    const result = allocateBenefitCoupons(coupons, 500);
+    expect(result.ok).toBe(true);
+    if (result.ok) {
+      expect(result.allocations).toEqual([
+        { couponId: '1', amount: 300 },
+        { couponId: '2', amount: 200 },
+      ]);
+    }
+  });
+
+  it('rejects when total balance insufficient', () => {
+    expect(allocateBenefitCoupons(coupons, 800).ok).toBe(false);
+  });
+});
+
+describe('calcBenefitSummary', () => {
+  it('caps max redeem by total and limit', () => {
+    expect(calcBenefitSummary([300, 400])).toEqual({
+      totalBalance: 700,
+      maxRedeemAmount: 500,
+      activeCouponCount: 2,
+    });
+    expect(calcBenefitSummary([100])).toEqual({
+      totalBalance: 100,
+      maxRedeemAmount: 100,
+      activeCouponCount: 1,
+    });
+  });
+});