merge: Improved CaesarsCipher Algorithm (#963)

* chore: added helper variable

* feat: added new rotation option

* Revert "chore: added helper variable"

This reverts commit 489544da0a3d479910fbea020d3be3d0d10681bf.

Ciphers/test/CaesarsCipher.test.js

@@ -0,0 +1,16 @@
+import caesarsCipher from '../CaesarsCipher'
+
+describe('Testing the caesarsCipher function', () => {
+  it('Test - 1, Testing for invalid types', () => {
+    expect(() => caesarsCipher(false, 3)).toThrow()
+    expect(() => caesarsCipher('false', -1)).toThrow()
+    expect(() => caesarsCipher('true', null)).toThrow()
+  })
+
+  it('Test - 2, Testing for valid string and rotation', () => {
+    expect(caesarsCipher('middle-Outz', 2)).toBe('okffng-Qwvb')
+    expect(caesarsCipher('abcdefghijklmnopqrstuvwxyz', 3)).toBe('defghijklmnopqrstuvwxyzabc')
+    expect(caesarsCipher('Always-Look-on-the-Bright-Side-of-Life', 5)).toBe('Fqbfdx-Qttp-ts-ymj-Gwnlmy-Xnij-tk-Qnkj')
+    expect(caesarsCipher('THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG', 23)).toBe('QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD')
+  })
+})