feat(tiered_pricing): 🔴 should return price for any subscription

Author: adrianliz

exercises/graduated_tiered_prices/solutions/adrianliz/src/NumberOfSubscriptionsNotAllowed.ts

@@ -0,0 +1,5 @@
+export default class NumberOfSubscriptionsNotAllowed extends Error {
+  constructor() {
+    super("Number of subscriptions not allowed");
+  }
+}

exercises/graduated_tiered_prices/solutions/adrianliz/tests/GraduatedTieredPricing.test.ts

@@ -1,6 +1,12 @@
 import GraduatedTieredPricing from "../src/GraduatedTieredPricing";
+import NumberOfSubscriptionsNotAllowed from "../src/NumberOfSubscriptionsNotAllowed";
 
 describe("Graduated tiered pricing should", () => {
+  it("calculate the price for 0 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(0)).toThrow(NumberOfSubscriptionsNotAllowed);
+  });
+
   it("calculate the price for 1 subscription", () => {
     const pricing = new GraduatedTieredPricing();
     expect(pricing.priceFor(1)).toBe(299);
@@ -15,6 +21,26 @@ describe("Graduated tiered pricing should", () => {
     const pricing = new GraduatedTieredPricing();
     expect(pricing.priceFor(3)).toBe(837);
   });
+
+  it("calculate the price for 11 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(11)).toBe(2990);
+  });
+
+  it("calculate the price for 26 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(26)).toBe(6294);
+  });
+
+  it("calculate the price for 50 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(50)).toBe(10950);
+  });
+
+  it("calculate the price for 100 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(100)).toBe(21900);
+  });
 });
 
 test("test framework working", async () => {