mocha tests and solution for http://www.reddit.com/r/dailyprogrammer/comments/1heozl/070113_challenge_131_easy_who_tests_the_tests/

whoTestsSolution.js

// readable solution
var TestTester = exports;

TestTester.run = function(string) {
  var good = 'Good test data'
    , bad = 'Mismatch! Bad test data'
    , splitString = string.split(' ')
    , output = bad
  if (splitString[0] === '0') {
    output = ( isMirrors(splitString[1], splitString[2]) ? good : bad )
  } else if (splitString[0] === '1') {
    output = ( isAllCaps(splitString[1], splitString[2]) ? good : bad )
  }
  return output
}

var isMirrors = function(first, second) {
  var mirror = function (string) {
    var splitString = string.split('')
      , mirror = ''
    for (var i = 0, len = splitString.length; i < len; ++i) {
      mirror = splitString[i] + mirror
    }
    return mirror
  }
  return first && second && mirror(first) === second
}

var isAllCaps = function(first, second) {
  return first && second && first.toUpperCase() === second
}

whoTestsTest.js

var assert = require('assert')
var TestTester = require('../scripts/TestTester.js')

describe('TestTester', function() {
  describe('#run()', function() {
    it('should return "Good test data" if type is 0 and strings are mirrors', function() {
      assert.equal('Good test data', TestTester.run('0 Car raC'))
      assert.equal('Good test data', TestTester.run('0 01234 43210'))
    })
    it('should return "Mismatch! Bad test data" if type is 0 and strings are not mirrors', function() {
      assert.equal('Mismatch! Bad test data', TestTester.run('0 Alpha AhplA'))
      assert.equal('Mismatch! Bad test data', TestTester.run('0 Discuss noissucsiD'))
    })
    it('should return "Good test data" if type is 1 and second string is the first in all caps', function() {
      assert.equal('Good test data', TestTester.run('1 Batman BATMAN'))
      assert.equal('Good test data', TestTester.run('1 Graph GRAPH'))
    })
    it('should return "Mismatch! Bad test data" if type is 1 and second string is not the first in all caps', function() {
      assert.equal('Mismatch! Bad test data', TestTester.run('1 One one'))
      assert.equal('Mismatch! Bad test data', TestTester.run('1 two three'))
    })
  })
})