merge: Add test cases (TheAlgorithms#854)

Author: Yatin-kathuria

Recursive/FibonacciNumberRecursive.js

@@ -1,15 +1,17 @@
 
-// https://en.wikipedia.org/wiki/Fibonacci_number
-
 /**
- * Return the N-th Fibonacci number
- *
- * @param {number} N
- * @returns {number}
+ * @function Fibonacci
+ * @description Function to return the N-th Fibonacci number.
+ * @param {Integer} n - The input integer
+ * @return {Integer} - Return the N-th Fibonacci number
+ * @see [Fibonacci](https://en.wikipedia.org/wiki/Fibonacci_number)
  */
-export const fibonacci = (N) => {
- if (N === 0 || N === 1) {
- return N
+
+const fibonacci = (n) => {
+ if (n < 2) {
+ return n
  }
- return fibonacci(N - 2) + fibonacci(N - 1)
+ return fibonacci(n - 2) + fibonacci(n - 1)
 }
+
+export { fibonacci }

Recursive/test/FibonacciNumberRecursive.test.js

@@ -0,0 +1,19 @@
+import { fibonacci } from '../FibonacciNumberRecursive'
+
+describe('FibonacciNumberRecursive', () => {
+ it('should return 0', () => {
+ expect(fibonacci(0)).toBe(0)
+ })
+
+ it('should return 1', () => {
+ expect(fibonacci(1)).toBe(1)
+ })
+
+ it('should return 5', () => {
+ expect(fibonacci(5)).toBe(5)
+ })
+
+ it('should return 9', () => {
+ expect(fibonacci(9)).toBe(34)
+ })
+})