feat(tip): support tiered coffee gifts

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

@@ -29,34 +29,51 @@ function makePlan(input: Partial<PaymentPlanInput>): PaymentPlan {
 }
 
 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({
+  it("uses the legacy tip coffee plan only for small", () => {
+    const plan = makePlan({
       planId: "tip_coffee",
-      planName: "Coffee",
-      orderType: "custom_tip",
     });
 
-    expect(findTipCoffeePlan([byOrderType, byPlanId])).toBe(byPlanId);
+    expect(findTipCoffeePlan([makePlan({}), plan], "small")).toBe(plan);
+    expect(findTipCoffeePlan([plan], "medium")).toBeNull();
   });
 
-  it("falls back to the tip coffee order type", () => {
-    const plan = makePlan({
-      planId: "legacy_coffee",
-      orderType: "tip_coffee",
+  it("matches medium and large coffee plans independently", () => {
+    const medium = makePlan({
+      planId: "tip_coffee_medium",
+      orderType: "tip_coffee_medium",
+      amountCents: 999,
+    });
+    const large = makePlan({
+      planId: "tip_coffee_large",
+      orderType: "tip_coffee_large",
+      amountCents: 1999,
     });
 
-    expect(findTipCoffeePlan([makePlan({}), plan])).toBe(plan);
+    expect(findTipCoffeePlan([large, medium], "medium")).toBe(medium);
+    expect(findTipCoffeePlan([medium, large], "large")).toBe(large);
+  });
+
+  it("does not infer a coffee tier from order type or amount", () => {
+    const ambiguousPlan = makePlan({
+      planId: "legacy_coffee",
+      orderType: "tip_coffee_medium",
+      amountCents: 999,
+    });
+
+    expect(findTipCoffeePlan([ambiguousPlan], "medium")).toBeNull();
   });
 
   it("formats USD prices with the product-style label", () => {
-    expect(formatTipPrice(makePlan({ amountCents: 500, currency: "USD" }))).toBe(
-      "US$ 5",
-    );
+    expect(
+      formatTipPrice(makePlan({ amountCents: 500, currency: "USD" }), "small"),
+    ).toBe("US$ 5");
+  });
+
+  it("uses the selected coffee price when its plan is unavailable", () => {
+    expect(formatTipPrice(null, "small")).toBe("US$ 4.99");
+    expect(formatTipPrice(null, "medium")).toBe("US$ 9.99");
+    expect(formatTipPrice(null, "large")).toBe("US$ 19.99");
   });
 
   it("treats guest and notLoggedIn as non-real login states", () => {