DecimalToHex

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

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())
+  })
+})