added validate cvv /cvc feature

index.js

@@ -70,9 +70,29 @@ function validateCreditCardNumber(cardNumber) {
   return sum % 10 === 0;
 }
 
+function validateCVVORCVCCode(securityCode) {
+  // Remove any spaces or dashes from the security code
+  securityCode = securityCode.replace(/[^\d]/g, "");
+
+  // Check if the security code is empty or not a number
+  if (securityCode === "" || isNaN(securityCode)) {
+    return false;
+  }
+
+  // Check if the security code is 3 or 4 digits long
+  var validLengths = [3, 4];
+  if (!validLengths.includes(securityCode.length)) {
+    return false;
+  }
+
+  // The security code is valid
+  return true;
+}
+
 module.exports = {
   isCreditCard,
   isEncryptedToken,
   detectCardType,
   validateCreditCardNumber,
+  validateCVVORCVCCode,
 };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "card-validator-utils",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "Library package util for payment industry",
   "main": "index.js",
   "scripts": {

test/index.test.js

@@ -3,6 +3,7 @@ const {
   isEncryptedToken,
   detectCardType,
   validateCreditCardNumber,
+  validateCVVORCVCCode,
 } = require("../index");
 
 describe("Testing credit card Functionality", () => {
@@ -53,6 +54,21 @@ describe("Validate the card number", () => {
     expect(validateCreditCardNumber("30569309025904")).toBe(true);
   });
 
-  test("should return false for invalid card number", () => {});
-  expect(validateCreditCardNumber("42428974842424242")).toBe(false);
+  test("should return false for invalid card number", () => {
+    expect(validateCreditCardNumber("42428974842424242")).toBe(false);
+  });
+});
+
+describe("Validate the CVV/CVC number", () => {
+  test("should return true for valid CVV / CVC", () => {
+    expect(validateCVVORCVCCode("234")).toBe(true);
+    expect(validateCVVORCVCCode("2345")).toBe(true);
+    expect(validateCVVORCVCCode("8987")).toBe(true);
+    expect(validateCVVORCVCCode("098")).toBe(true);
+  });
+
+  test("should return false for invalid CVV / CVC", () => {
+    expect(validateCVVORCVCCode("67")).toBe(false);
+    expect(validateCVVORCVCCode("jhjjhh")).toBe(false);
+  });
 });