Add test case for the last tier

Author: xetxeberria

exercises/tiered_pricing/solutions/xetxeberria-ts/src/tieredPricing.ts

@@ -10,6 +10,7 @@ function calculateLicensePrice(licenseAmount: number): number {
   if (licenseAmount >= 3) licensePrice = 239;
   if (licenseAmount >= 11) licensePrice = 219;
   if (licenseAmount >= 26) licensePrice = 199;
+  if (licenseAmount >= 51) licensePrice = 149;
 
   return licensePrice;
 }

exercises/tiered_pricing/solutions/xetxeberria-ts/tests/tieredPricing.test.ts

@@ -20,4 +20,8 @@ describe("TieredPricing should", () => {
   test("return 5373 for 27 licenses", async () => {
     expect(tieredPricing(27)).toBe(5373);
   });
+
+  test("return 7599 for 51 licenses", async () => {
+    expect(tieredPricing(51)).toBe(7599);
+  });
 });