test('format ordinal', () => {
  assert.equal(moment([2011, 0, 1]).format('DDDo'), '১', '১');
  assert.equal(moment([2011, 0, 2]).format('DDDo'), '২', '২');
  assert.equal(moment([2011, 0, 3]).format('DDDo'), '৩', '৩');
  assert.equal(moment([2011, 0, 4]).format('DDDo'), '৪', '৪');