From 51415f8a12ffe60edcb7fc31a18305d6128496e7 Mon Sep 17 00:00:00 2001
From: YATIN KATHURIA <47096348+Yatin-kathuria@users.noreply.github.com>
Date: Sat, 27 Nov 2021 12:58:18 +0530
Subject: [PATCH] merge: Add test case (#851)

* Add test case

* minor fix

* delete files

* rename file
---
 Recursive/Factorial.js           | 18 ++++++++++++++++++
 Recursive/factorial.js           | 11 -----------
 Recursive/test/Factorial.test.js | 11 +++++++++++
 3 files changed, 29 insertions(+), 11 deletions(-)
 create mode 100644 Recursive/Factorial.js
 delete mode 100644 Recursive/factorial.js
 create mode 100644 Recursive/test/Factorial.test.js

diff --git a/Recursive/Factorial.js b/Recursive/Factorial.js
new file mode 100644
index 000000000..5d882e5ea
--- /dev/null
+++ b/Recursive/Factorial.js
@@ -0,0 +1,18 @@
+/**
+ * @function Factorial
+ * @description function to find factorial using recursion.
+ * @param {Integer} n - The input integer
+ * @return {Integer} - Factorial of n.
+ * @see [Factorial](https://en.wikipedia.org/wiki/Factorial)
+ * @example 5! = 1*2*3*4*5 = 120
+ * @example 2! = 1*2 = 2
+ */
+
+const factorial = (n) => {
+  if (n === 0) {
+    return 1
+  }
+  return n * factorial(n - 1)
+}
+
+export { factorial }
diff --git a/Recursive/factorial.js b/Recursive/factorial.js
deleted file mode 100644
index ada7627c0..000000000
--- a/Recursive/factorial.js
+++ /dev/null
@@ -1,11 +0,0 @@
-// function to find factorial using recursion
-// example :
-//    5! = 1*2*3*4*5 = 120
-//    2! = 1*2 = 2
-
-export const factorial = (n) => {
-  if (n === 0) {
-    return 1
-  }
-  return n * factorial(n - 1)
-}
diff --git a/Recursive/test/Factorial.test.js b/Recursive/test/Factorial.test.js
new file mode 100644
index 000000000..b124efea5
--- /dev/null
+++ b/Recursive/test/Factorial.test.js
@@ -0,0 +1,11 @@
+import { factorial } from '../Factorial'
+
+describe('Factorial', () => {
+  it('should return factorial 1 for value "0"', () => {
+    expect(factorial(0)).toBe(1)
+  })
+
+  it('should return factorial 120 for value "5"', () => {
+    expect(factorial(5)).toBe(120)
+  })
+})