From 3f32320c8524437a4bebb8c08be2521e13d136be Mon Sep 17 00:00:00 2001
From: Eric Lavault <39483232+lvlte@users.noreply.github.com>
Date: Sat, 9 Oct 2021 13:25:34 +0200
Subject: [PATCH] Comply with ESM. Convert live code example to Jest test.

---
 Maths/PermutationAndCombination.js           | 19 +------------------
 Maths/test/PermutationAndCombination.test.js | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 18 deletions(-)
 create mode 100644 Maths/test/PermutationAndCombination.test.js

diff --git a/Maths/PermutationAndCombination.js b/Maths/PermutationAndCombination.js
index 1146230fb..ba99888ce 100644
--- a/Maths/PermutationAndCombination.js
+++ b/Maths/PermutationAndCombination.js
@@ -47,21 +47,4 @@ const combination = (n, r) => {
 }
 
 // Exports the functions to be used in other files.
-module.exports.factorial = factorial
-module.exports.permutation = permutation
-module.exports.combination = combination
-
-/**
- * @example
-
-   const funcs = require("./PermutationAndCombination.js");
-
-   console.log(funcs.factorial(5));
-   console.log(funcs.permutation(5, 2));
-   console.log(funcs.combination(5, 2));
-
- * @output
-   120
-   20
-   10
- */
+export { factorial, permutation, combination }
diff --git a/Maths/test/PermutationAndCombination.test.js b/Maths/test/PermutationAndCombination.test.js
new file mode 100644
index 000000000..92fc576c1
--- /dev/null
+++ b/Maths/test/PermutationAndCombination.test.js
@@ -0,0 +1,19 @@
+import { factorial, permutation, combination } from '../PermutationAndCombination'
+
+describe('Factorial', () => {
+  it('factorial(5)', () => {
+    expect(factorial(5)).toBe(120)
+  })
+})
+
+describe('Permutation', () => {
+  it('permutation(5, 2)', () => {
+    expect(permutation(5, 2)).toBe(20)
+  })
+})
+
+describe('Combination', () => {
+  it('combination(5, 2)', () => {
+    expect(combination(5, 2)).toBe(10)
+  })
+})