paulos-palindrome/test/test.js

__An NPM module sample.__ _Usage:_ ```javascript npm install paulos-palindrome let Phrase = require('paulos-palindrome') let string = new Phrase("Did I do, O God, did I as I said I’d do? Good! I did.") console.log(string.palindrome()) ```

let assert = require('assert')
let Phrase = require('../index.js')

describe('Phrase', function(){
  describe('#palindrome', function(){
    it('should return false for a non-palindrome', function(){
      let nonPalindrome = new Phrase('apple')
      assert(!nonPalindrome.palindrome())
    })

    it('should return true for a palindrome', function(){
      let palindrome = new Phrase('racecar')
      assert(palindrome.palindrome())
    })

    it("should return true for a mixed-case palindrome", function(){
      let mixedCase = new Phrase('RaceCar')
      assert(mixedCase.palindrome())
    })

    it("should return true for a palindrome with punctuation", function(){
      let punctuatedPalindrome = new Phrase("Madam, I'm Adam.")
      assert(punctuatedPalindrome.palindrome())
    })

    it('should return false for an empty string', function(){
      let emptyPhrase = new Phrase('')
      assert(!emptyPhrase.palindrome())
    })
  })

  describe('#letters', function(){
    it('should return only letters', function(){
      let punctuatedPalindrome = new Phrase("Madam, I'm Adam.")
      assert.strictEqual(punctuatedPalindrome.letters(), 'MadamImAdam')
    })
    it('should return the empty string on no match', function(){
      let noLetters = new Phrase("1234.56")
      assert.strictEqual(noLetters.letters(), '')
    })
  })
})