diff --git a/Conversions/DecimalToHex.js b/Conversions/DecimalToHex.js
index 5b130de9a..f13a93e09 100644
--- a/Conversions/DecimalToHex.js
+++ b/Conversions/DecimalToHex.js
@@ -19,6 +19,4 @@ function decimalToHex (num) {
   return intToHex(num) + hexOut.join('')
 }
 
-// test cases
-console.log(decimalToHex(999098) === 'F3EBA')
-console.log(decimalToHex(123) === '7B')
+export { decimalToHex }
diff --git a/Conversions/test/DecimalToHex.test.js b/Conversions/test/DecimalToHex.test.js
new file mode 100644
index 000000000..53cd88473
--- /dev/null
+++ b/Conversions/test/DecimalToHex.test.js
@@ -0,0 +1,15 @@
+import { decimalToHex } from '../DecimalToHex'
+
+describe('DecimalToHex', () => {
+  it('expects to return correct hexadecimal value', () => {
+    expect(decimalToHex(255)).toBe('FF')
+  })
+
+  it('expects to return correct hexadecimal value, matching (num).toString(16)', () => {
+    expect(decimalToHex(32768)).toBe((32768).toString(16).toUpperCase())
+  })
+
+  it('expects to not handle negative numbers', () => {
+    expect(decimalToHex(-32768)).not.toBe((-32768).toString(16).toUpperCase())
+  })
+})