password-validator.test.js

/*
Password Validation

Write a program that should check if a password is valid
and returns a boolean

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.

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 is valid when it meets all rules", () => {
  // Arrange
  const password = "Ab1!c";

  // Act
  const result = isValidPassword(password);

  // Assert
  expect(result).toEqual(true);
});

test("password is invalid when it is shorter than 5 characters", () => {
  const password = "A1!a";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when it has no uppercase letter", () => {
  const password = "abcde1!";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when it has no lowercase letter", () => {
  const password = "ABCDE1!";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when it has no number", () => {
  const password = "Abcde!";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when it has no required symbol", () => {
  const password = "Abcde1";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when it has been used before", () => {
  const password = "Password1!";
  const result = isValidPassword(password);

  expect(result).toEqual(false);
});

test("password is invalid when no password is provided", () => {
  const result = isValidPassword();

  expect(result).toEqual(false);
});

test("password is invalid when the value is not a string", () => {
  const result = isValidPassword(12345);

  expect(result).toEqual(false);
});