Test-Driven React

Example Palindrome Finder Solution

ch2/tests/palindromes.test.js

const palindromes = require('../palindromes');
const { prepareStr, isPalindrome, stringStartPalindrome } = palindromes;

describe('prepareStr()', () => {
  it('converts the given string to lowercase', () => {
    expect(prepareStr('aAaA')).toBe('aaaa');
  });

  it('removes all non-letter characters', () => {
    expect(
      prepareStr('To infinity, and beyond!')
    ).toBe('toinfinityandbeyond');
  });
});

describe('isPalindrome()', () => {
  it('returns true when given a palindrome', () => {
    expect(isPalindrome('aba')).toBe(true);
    expect(isPalindrome('abba')).toBe(true);
  });

  it('returns false when given a non-palindrome', () => {