feat(tip): add coffee tipping page

src/app/tip/__tests__/tip-screen.helpers.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, it } from "vitest";
+
+import { PaymentPlan } from "@/data/dto/payment";
+import type { PaymentPlanInput } from "@/data/schemas/payment/payment_plan";
+
+import {
+  findTipCoffeePlan,
+  formatTipPrice,
+  isRealLoginStatus,
+} from "../tip-screen.helpers";
+
+function makePlan(input: Partial<PaymentPlanInput>): PaymentPlan {
+  return PaymentPlan.from({
+    planId: "coins_100",
+    planName: "Coins",
+    orderType: "dol",
+    vipDays: null,
+    dolAmount: 100,
+    creditBalance: 100,
+    amountCents: 990,
+    originalAmountCents: null,
+    dailyPriceCents: null,
+    currency: "USD",
+    isFirstRechargeOffer: false,
+    firstRechargeDiscountPercent: null,
+    promotionType: null,
+    ...input,
+  });
+}
+
+describe("tip screen helpers", () => {
+  it("prefers the exact tip coffee plan id", () => {
+    const byOrderType = makePlan({
+      planId: "legacy_coffee",
+      planName: "Legacy coffee",
+      orderType: "tip_coffee",
+    });
+    const byPlanId = makePlan({
+      planId: "tip_coffee",
+      planName: "Coffee",
+      orderType: "custom_tip",
+    });
+
+    expect(findTipCoffeePlan([byOrderType, byPlanId])).toBe(byPlanId);
+  });
+
+  it("falls back to the tip coffee order type", () => {
+    const plan = makePlan({
+      planId: "legacy_coffee",
+      orderType: "tip_coffee",
+    });
+
+    expect(findTipCoffeePlan([makePlan({}), plan])).toBe(plan);
+  });
+
+  it("formats USD prices with the product-style label", () => {
+    expect(formatTipPrice(makePlan({ amountCents: 500, currency: "USD" }))).toBe(
+      "US$ 5",
+    );
+  });
+
+  it("treats guest and notLoggedIn as non-real login states", () => {
+    expect(isRealLoginStatus("guest")).toBe(false);
+    expect(isRealLoginStatus("notLoggedIn")).toBe(false);
+    expect(isRealLoginStatus("facebook")).toBe(true);
+  });
+});