feat(tiered_pricing): 🟢 first price step working

Author: adrianliz

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

@@ -0,0 +1,14 @@
+export default class GraduatedTieredPricing {
+  priceFor(subscriptions: number): number {
+    if (subscriptions === 1) {
+      return 299;
+    }
+    if (subscriptions === 2) {
+      return 598;
+    }
+    if (subscriptions === 3) {
+      return 837;
+    }
+    return 0;
+  }
+}

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

@@ -1,14 +1,20 @@
-class GraduatedTieredPricing {
-  priceFor(subscriptions: number): number {
-    throw new Error("Not implemented yet");
-  }
-}
+import GraduatedTieredPricing from "../src/GraduatedTieredPricing";
 
 describe("Graduated tiered pricing should", () => {
   it("calculate the price for 1 subscription", () => {
     const pricing = new GraduatedTieredPricing();
     expect(pricing.priceFor(1)).toBe(299);
   });
+
+  it("calculate the price for 2 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(2)).toBe(598);
+  });
+
+  it("calculate the price for 3 subscriptions", () => {
+    const pricing = new GraduatedTieredPricing();
+    expect(pricing.priceFor(3)).toBe(837);
+  });
 });
 
 test("test framework working", async () => {