nelsonic/coin-change

var test  = require('tape');
var C = require('./');

test('total=187&paid=400', function (t) {
  C.getChange(187, 400, function (err, change) {
    t.equal(err, null);
    t.deepEqual(change, [200, 10, 2, 1]);
    t.end();
  });
});

test('both values undefined', function (t) {
  C.getChange(undefined, undefined, function (err, change) {
    t.equal(err, C.noZeroErrMsg);
    t.deepEqual(change, []);
    t.end();
  });
});

test('Null values should not be permitted: total=null&paid=null', function (t) {
  C.getChange(null, null, function (err, change) {
    t.equal(err, C.noChangeErrMsg);
    t.deepEqual(change, []);
    t.end();
  });
});

test('Strings should fail total=hello&paid=world', function (t) {
  C.getChange('hello', 'world', function (err, change) {
    t.equal(err, C.noZeroErrMsg);
    t.deepEqual(change, []);
    t.end();
  });
});

test('Test change (difference) is Zero', function (t) {
  C.getChange(42, 42, function (err, change) {
    t.equal(err, C.noChangeErrMsg);
    t.deepEqual(change, []);
    t.end();
  });
});

test('Large numbers should be rejected', function (t) {
  var tooBig = Math.pow(2, 53);
  console.log(tooBig);
  C.getChange(tooBig, tooBig - 2, function (err, change) {
    t.equal(err, C.tooBigErrMsg);
    t.deepEqual(change, []);
    t.end();
  });
});