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