From 83b4dd82909badb19ad0a10e658ace64d69cd4da Mon Sep 17 00:00:00 2001
From: Piotr Idzik <65706193+vil02@users.noreply.github.com>
Date: Sat, 2 Mar 2024 08:55:14 +0100
Subject: [PATCH] fix: cleanup `CheckKishnamurthyNumber` (#1626)

---
 Maths/CheckKishnamurthyNumber.js           |  5 ++++-
 Maths/test/CheckKishnamurthyNumber.test.js | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 Maths/test/CheckKishnamurthyNumber.test.js

diff --git a/Maths/CheckKishnamurthyNumber.js b/Maths/CheckKishnamurthyNumber.js
index 7a0cc9a0c..5098b0fa7 100644
--- a/Maths/CheckKishnamurthyNumber.js
+++ b/Maths/CheckKishnamurthyNumber.js
@@ -24,7 +24,10 @@ const factorial = (n) => {
 const CheckKishnamurthyNumber = (number) => {
   // firstly, check that input is a number or not.
   if (typeof number !== 'number') {
-    return new TypeError('Argument is not a number.')
+    throw new TypeError('Argument is not a number.')
+  }
+  if (number === 0) {
+    return false
   }
   // create a variable to store the sum of all digits factorial.
   let sumOfAllDigitFactorial = 0
diff --git a/Maths/test/CheckKishnamurthyNumber.test.js b/Maths/test/CheckKishnamurthyNumber.test.js
new file mode 100644
index 000000000..4f2e0db95
--- /dev/null
+++ b/Maths/test/CheckKishnamurthyNumber.test.js
@@ -0,0 +1,18 @@
+import { CheckKishnamurthyNumber } from '../CheckKishnamurthyNumber'
+
+describe('CheckKishnamurthyNumber', () => {
+  it.each([1, 2, 145, 40585])('returns true for %i', (num) => {
+    expect(CheckKishnamurthyNumber(num)).toBe(true)
+  })
+
+  it.each([0, 3, 4, 5, 100, 146, 1019823, -1])(
+    'returns false for %i',
+    (num) => {
+      expect(CheckKishnamurthyNumber(num)).toBe(false)
+    }
+  )
+
+  it('should throw when input is not a number', () => {
+    expect(() => CheckKishnamurthyNumber('2')).toThrowError()
+  })
+})