Adding jest test case for special cases

Author: KayanatSuleman

Sprint-3/2-practice-tdd/get-ordinal-number.test.js

@@ -39,4 +39,11 @@ test("should append 'th' for numbers ending with 0 or 4-9", () => {
   expect(getOrdinalNumber(10)).toEqual("10th");
   expect(getOrdinalNumber(20)).toEqual("20th");
   expect(getOrdinalNumber(49)).toEqual("49th");
-});
+});
+
+// Case 5: Special cases 11, 12, 13, 14, (always "th")
+test("should append 'th' for numbers ending with 11, 12, or 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});