Message Mixer

I am on step 3 of Message Mixer and it is telling me that I should receive an error. However, when I run my code there is no error that pops up. Did I forget to move something?

message-mixer.js

const encryptionMethod = getEncryptionMethod(); process.stdin.on('data', (userInput) => { displayEncryptedMessage(encryptionMethod, userInput); }); /* Helper function for determining which cipher method the user chose when they ran the program. */ function getEncryptionMethod() { let encryptionMethod; const encryptionType = process.argv[2]; if (encryptionType === 'symbol') { encryptionMethod = symbolCipher; } else if (encryptionType === 'reverse') { encryptionMethod = reverseCipher; } else if (encryptionType === 'caesar') { let amount = Number(process.argv[3]); if (Number.isNaN(amount)) { process.stdout.write(`Try again with a valid amount argument. \n`) process.exit(); } encryptionMethod = (str) => caesarCipher(str, amount); } else { process.stdout.write(`Try again with a valid encryption type. \n`) process.exit(); } process.stdout.write('Enter the message you would like to encrypt...\n> '); return encryptionMethod; } /* Helper function for displaying the encrypted message to the user. */ function displayEncryptedMessage(encryptionMethod, userInput) { let str = userInput.toString().trim(); let output = encryptionMethod(str); process.stdout.write(`\nHere is your encrypted message:\n> ${output}\n`) process.exit(); }

encryptors.js

const caesarCipher = (str, amount = 0) => { if (amount < 0) { return caesarCipher(str, amount + 26); } let output = ''; for (let i = 0; i < str.length; i++) { let char = str[i]; if (char.match(/[a-z]/i)) { let code = str.charCodeAt(i); if (code >= 65 && code <= 90) { char = String.fromCharCode(((code - 65 + amount) % 26) + 65); } else if (code >= 97 && code <= 122) { char = String.fromCharCode(((code - 97 + amount) % 26) + 97); } } output += char; } return output; }; const symbolCipher = (str) => { const symbols = { 'i': '!', '!': 'i', 'l': '1', '1': 'l', 's': '$', '$': 's', 'o': '0', '0': 'o', 'a': '@', '@': 'a', 'e': '3', '3': 'e', 'b': '6', '6': 'b' } let output = ''; for (let i = 0; i < str.length; i++) { let char = str.toLowerCase()[i]; if (symbols[char]) { output += symbols[char] } else { output += char; } } return output; } const reverseCipher = (sentence) => { let words = sentence.split(' '); for (let i = 0; i < words.length; i++) { words[i] = words[i].split('').reverse().join(''); } return words.join(' '); }; module.exports.caesarCipher = () = {} module.exports.symbolCipher = () = {} module.exports.reverseCipher = () = {}