Module crypto not found

I'm not really sure what you're expecting - the code doesn't print anything unless there's an error. If you added some print statements to the code then you'd see something. Try changing test to:

function test(a, b) {
  tests++;
  var ar = a();
  console.log("Expecting "+b);
  console.log("Got "+ar);
  if (ar!=b) {
    console.log("Test "+tests,a,"did not equal",b,", it was ", ar);
  } else {
   testPass++;
  }
}

Or even just copy/paste some of the commands out and try running them on Espruino's console.