merge: Add test case to Find Second Largest Element Algorithm (TheAlgorithms#1037)

Author: Ankush263

Sorts/test/FindSecondLargestElement.test.js

@@ -0,0 +1,13 @@
+import { secondLargestElement } from '../FindSecondLargestElement'
+
+test('The second largest element of the array [1, 2, 3, 4, 5] is 4', () => {
+  const array = [1, 2, 3, 4, 5]
+  const res = secondLargestElement(array)
+  expect(res).toEqual(4)
+})
+
+test('The second largest element of the array [-1, -2, -3, -4, -5] is -2', () => {
+  const array = [-1, -2, -3, -4, -5]
+  const res = secondLargestElement(array)
+  expect(res).toEqual(-2)
+})