Rename to CaesarCipher

Ciphers/CaesarsCipher.js → Ciphers/CaesarCipher.js

@@ -6,7 +6,7 @@
  * @param {number} rotation - the number of rotation, expect real number ( > 0)
  * @return {string} - decrypted string
  */
-const caesarsCipher = (str, rotation) => {
+const caesarCipher = (str, rotation) => {
   if (typeof str !== 'string' || !Number.isInteger(rotation) || rotation < 0) {
     throw new TypeError('Arguments are invalid')
   }
@@ -29,4 +29,4 @@ const caesarsCipher = (str, rotation) => {
   })
 }
 
-export default caesarsCipher
+export default caesarCipher

Ciphers/test/CaesarCipher.test.js

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