merge: add test case and description (TheAlgorithms#842)

Author: Yatin-kathuria

Dynamic-Programming/ClimbingStairs.js

@@ -1,7 +1,10 @@
-/*
- * You are climbing a stair case. It takes n steps to reach to the top.
- * Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
-*/
+/**
+ * @function ClimbStairs
+ * @description You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
+ * @param {Integer} n - The input integer
+ * @return {Integer} distinct ways can you climb to the top.
+ * @see [Climb_Stairs](https://www.geeksforgeeks.org/count-ways-reach-nth-stair/)
+ */
 
 const climbStairs = (n) => {
   let prev = 0

Dynamic-Programming/tests/ClimbingStairs.test.js

@@ -0,0 +1,19 @@
+import { climbStairs } from '../ClimbingStairs'
+
+describe('ClimbingStairs', () => {
+  it('climbStairs of 0', () => {
+    expect(climbStairs(0)).toBe(1)
+  })
+
+  it('climbStairs of 1', () => {
+    expect(climbStairs(1)).toBe(1)
+  })
+
+  it('climbStairs of 10', () => {
+    expect(climbStairs(10)).toBe(89)
+  })
+
+  it('climbStairs of 15', () => {
+    expect(climbStairs(15)).toBe(987)
+  })
+})