Add code and tests for checking power of 2

Bit-Manipulation/test/IsPowerOfTwo.test.js

@@ -0,0 +1,21 @@
+import {IsPowerOfTwo} from '../IsPowerOfTwo'
+
+test('Check if 0 is a power of 2 or not:', () => {
+  const res = IsPowerOfTwo(1, 0)
+  expect(res).toBe(false)
+})
+
+test('Check if 4 is a power of 2 or not:', () => {
+  const res = IsPowerOfTwo(4)
+  expect(res).toBe(true)
+})
+
+test('Check if 1024 is a power of 2 or not:', () => {
+  const res = IsPowerOfTwo(1024)
+  expect(res).toBe(true)
+})
+
+test('Check if 1025 is a power of 2 or not:', () => {
+  const res = IsPowerOfTwo(1025)
+  expect(res).toBe(false)
+})