DecimalToHex

- Add test file DecimalToHex.test.js
- Add export to DecimalToHex.js
- Remove console.log from DecimalToHex.js

Conversions/DecimalToHex.js

@@ -1,4 +1,4 @@
-function intToHex (num) {
+function intToHex(num) {
   switch (num) {
     case 10: return 'A'
     case 11: return 'B'
@@ -10,7 +10,7 @@ function intToHex (num) {
   return num
 }
 
-function decimalToHex (num) {
+function decimalToHex(num) {
   const hexOut = []
   while (num > 15) {
     hexOut.unshift(intToHex(num % 16))
@@ -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 }

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())
+  })
+})