test('format month', () => {
  const expected =
    'Sẹ́rẹ́ Sẹ́r_Èrèlè Èrl_Ẹrẹ̀nà Ẹrn_Ìgbé Ìgb_Èbibi Èbi_Òkùdu Òkù_Agẹmo Agẹ_Ògún Ògú_Owewe Owe_Ọ̀wàrà Ọ̀wà_Bélú Bél_Ọ̀pẹ̀̀ Ọ̀pẹ̀̀'.split(
      '_'
    );