From 6cece088cacea92886849db4f69fc7b7e94c2573 Mon Sep 17 00:00:00 2001
From: Piotr Idzik <vil02@o2.pl>
Date: Wed, 15 May 2024 20:45:13 +0000
Subject: [PATCH] tests: add `HexToDecimal.test.js`

---
 Conversions/HexToDecimal.js           |  5 ++++-
 Conversions/test/HexToDecimal.test.js | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 Conversions/test/HexToDecimal.test.js

diff --git a/Conversions/HexToDecimal.js b/Conversions/HexToDecimal.js
index 31ae13932f..e402421399 100644
--- a/Conversions/HexToDecimal.js
+++ b/Conversions/HexToDecimal.js
@@ -1,4 +1,7 @@
 function hexToInt(hexNum) {
+  if (!/^[0-9A-F]+$/.test(hexNum)) {
+    throw new Error('Invalid hex string.')
+  }
   const numArr = hexNum.split('') // converts number to array
   return numArr.map((item, index) => {
     switch (item) {
@@ -29,4 +32,4 @@ function hexToDecimal(hexNum) {
   }, 0)
 }
 
-export { hexToInt, hexToDecimal }
+export { hexToDecimal }
diff --git a/Conversions/test/HexToDecimal.test.js b/Conversions/test/HexToDecimal.test.js
new file mode 100644
index 0000000000..816c70511d
--- /dev/null
+++ b/Conversions/test/HexToDecimal.test.js
@@ -0,0 +1,24 @@
+import { hexToDecimal } from '../HexToDecimal'
+
+describe('Testing HexToDecimal', () => {
+  it.each([
+    ['0', 0],
+    ['1', 1],
+    ['A', 10],
+    ['B', 11],
+    ['C', 12],
+    ['D', 13],
+    ['E', 14],
+    ['F', 15],
+    ['10', 16],
+    ['859', 2137],
+    ['4D2', 1234],
+    ['81323ABD92', 554893491602]
+  ])('check with %s', (hexStr, expected) => {
+    expect(hexToDecimal(hexStr)).toBe(expected)
+  })
+
+  it.each(['a', '-1', 'G', ''])('throws for %s', (hexStr) => {
+    expect(() => hexToDecimal(hexStr)).toThrowError()
+  })
+})