Complete ordinal number tests

Author: Frumentius-Rev

practice-tdd/get-ordinal-number.test.js

@@ -36,3 +36,9 @@ test("should append 'th' for other numbers", () => {
   expect(getOrdinalNumber(24)).toEqual("24th");
   expect(getOrdinalNumber(114)).toEqual("114th");
 });
+
+test("should append 'th' for numbers ending with 11, 12, 13", () => {
+  expect(getOrdinalNumber(11)).toEqual("11th");
+  expect(getOrdinalNumber(12)).toEqual("12th");
+  expect(getOrdinalNumber(13)).toEqual("13th");
+});