added tests for rodCutting and made some changes

Dynamic-Programming/tests/RodCutting.test.js

@@ -0,0 +1,22 @@
+import { rodCut } from '../RodCutting'
+
+test('Test Case 1', () => {
+    expect(rodCut([1,5,8,9,10,17,17,20],8)).toBe(22);
+})
+
+test('Test Case 2', () => {
+    expect(rodCut([1,5,4,2,1,11,19,12],8)).toBe(20);
+})
+
+test('Test Case 3', () => {
+    expect(rodCut([1,2,1],3)).toBe(3);
+})
+
+test('Test Case 4', () => {
+    expect(rodCut([5,4,3,2,1],5)).toBe(25);
+})
+
+test('Test Case 5', () => {
+    expect(rodCut([3,5,8,8,10,16,14,19],8)).toBe(24);
+})
+