merge: Upgraded hexToBinary function (#910)

* feat: used js object intead of switch

* pref: optimzed the algo with regex & replace method

* feat: add hex validation with test case

* feat: add type validation

* chore: fix grammar mistake

* docs: add binLookup comments

Conversions/test/HexToBinary.test.js

@@ -1,6 +1,18 @@
 import hexToBinary from '../HexToBinary'
 
-describe('hexToBinary', () => {
+describe('Testing hexToBinary', () => {
+  it('expects throw error in invalid types', () => {
+    expect(() => hexToBinary(false)).toThrowError()
+    expect(() => hexToBinary(null)).toThrowError()
+    expect(() => hexToBinary(23464)).toThrowError()
+  })
+
+  it('expects throw error in invalid hex', () => {
+    expect(() => hexToBinary('Hello i am not a valid Hex')).toThrowError()
+    expect(() => hexToBinary('Gf46f')).toThrowError()
+    expect(() => hexToBinary('M')).toThrowError()
+  })
+
   it('expects to return correct hexadecimal value', () => {
     expect(hexToBinary('8')).toBe('1000')
   })