Birmingham | 26-ITP-May | Gabriel Pawuoi | Sprint 3 | Stretch

Sprint-3/4-stretch/card-validator.js

@@ -0,0 +1,26 @@
+// Validates a credit card number string against the following rules:
+// - Must be exactly 16 digits (no letters or other characters)
+// - Must contain at least two different digits
+// - The final digit must be even
+// - The sum of all digits must be greater than 16
+
+function isValidCardNumber(cardNumber) {
+  // Rule 1: must be exactly 16 digit characters
+  if (!/^\d{16}$/.test(cardNumber)) return false;
+
+  const digits = cardNumber.split("").map(Number);
+
+  // Rule 2: at least two different digits must be present
+  if (new Set(digits).size < 2) return false;
+
+  // Rule 3: final digit must be even
+  if (digits[15] % 2 !== 0) return false;
+
+  // Rule 4: sum of all digits must be greater than 16
+  const sum = digits.reduce((acc, d) => acc + d, 0);
+  if (sum <= 16) return false;
+
+  return true;
+}
+
+module.exports = isValidCardNumber;

Sprint-3/4-stretch/card-validator.test.js

@@ -0,0 +1,30 @@
+const isValidCardNumber = require("./card-validator");
+
+test("should return true for a valid card number", () => {
+  expect(isValidCardNumber("9999777788880000")).toEqual(true);
+  expect(isValidCardNumber("6666666666661666")).toEqual(true);
+});
+
+test("should return false when card contains non-digit characters", () => {
+  expect(isValidCardNumber("a92332119c011112")).toEqual(false);
+});
+
+test("should return false when card has fewer than 16 digits", () => {
+  expect(isValidCardNumber("123456789012345")).toEqual(false);
+});
+
+test("should return false when card has more than 16 digits", () => {
+  expect(isValidCardNumber("12345678901234567")).toEqual(false);
+});
+
+test("should return false when all digits are the same", () => {
+  expect(isValidCardNumber("4444444444444444")).toEqual(false);
+});
+
+test("should return false when final digit is odd", () => {
+  expect(isValidCardNumber("6666666666666661")).toEqual(false);
+});
+
+test("should return false when sum of digits is not greater than 16", () => {
+  expect(isValidCardNumber("1111111111111110")).toEqual(false);
+});

Sprint-3/4-stretch/password-validator.js

@@ -1,6 +1,13 @@
+const previousPasswords = ["Pass1!", "Hello1#", "Secure1$"];
+
 function passwordValidator(password) {
-    return password.length < 5 ? false : true
+  if (password.length < 5) return false;
+  if (!/[A-Z]/.test(password)) return false;
+  if (!/[a-z]/.test(password)) return false;
+  if (!/[0-9]/.test(password)) return false;
+  if (!/[!#$%.*&]/.test(password)) return false;
+  if (previousPasswords.includes(password)) return false;
+  return true;
 }
 
-
-module.exports = passwordValidator;
+module.exports = { passwordValidator, previousPasswords };

Sprint-3/4-stretch/password-validator.test.js

@@ -1,26 +1,30 @@
-/* 
-Password Validation
+const { passwordValidator } = require("./password-validator");
 
-Write a program that should check if a password is valid
-and returns a boolean
+test("should return false when password has fewer than 5 characters", () => {
+  expect(passwordValidator("Ab1!")).toEqual(false);
+});
 
-To be valid, a password must:
-- Have at least 5 characters.
-- Have at least one English uppercase letter (A-Z)
-- Have at least one English lowercase letter (a-z)
-- Have at least one number (0-9)
-- Have at least one of the following non-alphanumeric symbols: ("!", "#", "$", "%", ".", "*", "&")
-- Must not be any previous password in the passwords array. 
+test("should return false when password has no uppercase letter", () => {
+  expect(passwordValidator("hello1!")).toEqual(false);
+});
 
-You must breakdown this problem in order to solve it. Find one test case first and get that working
-*/
-const isValidPassword = require("./password-validator");
-test("password has at least 5 characters", () => {
-    // Arrange
-    const password = "12345";
-    // Act
-    const result = isValidPassword(password);
-    // Assert
-    expect(result).toEqual(true);
-}
-);
+test("should return false when password has no lowercase letter", () => {
+  expect(passwordValidator("HELLO1!")).toEqual(false);
+});
+
+test("should return false when password has no number", () => {
+  expect(passwordValidator("Hello!")).toEqual(false);
+});
+
+test("should return false when password has no special character", () => {
+  expect(passwordValidator("Hello1")).toEqual(false);
+});
+
+test("should return false when password is a previous password", () => {
+  expect(passwordValidator("Pass1!")).toEqual(false);
+});
+
+test("should return true for a valid password meeting all criteria", () => {
+  expect(passwordValidator("Valid1!")).toEqual(true);
+  expect(passwordValidator("MyPass1$")).toEqual(true);
+});