test('format ordinal', () => {
  assert.equal(moment([2011, 0, 1]).format('DDDo'), '1', '1');
  assert.equal(moment([2011, 0, 2]).format('DDDo'), '2', '2');
  assert.equal(moment([2011, 0, 3]).format('DDDo'), '3', '3');
  assert.equal(moment([2011, 0, 4]).format('DDDo'), '4', '4');