text: const num_ja = require("..");
  
  test("number to japanese", () => {
    expect(num_ja.num_ja(0)).toBe("〇");
    expect(num_ja.num_ja(1)).toBe("一");
    expect(num_ja.num_ja(-1)).toBe("マイナス一");
    expect(num_ja.num_ja(100001101)).toBe("一億千百一");
    expect(num_ja.num_ja(1234567890)).toBe("十二億三千四百五十六万七千八百九十");
  });
  
  test("japanese to number", () => {
    expect(num_ja.ja_num("〇")).toBe(0);
    expect(num_ja.ja_num("一")).toBe(1);
    expect(num_ja.ja_num("マイナス一")).toBe(-1);
    expect(num_ja.ja_num("一億千百一")).toBe(100001101);
    expect(num_ja.ja_num("十二億三千四百五十六万七千八百九十")).toBe(1234567890);
  });
  
  test("ja_num other styles", () => {
    expect(num_ja.ja_num("零")).toBe(0);
    expect(num_ja.ja_num("壱")).toBe(1);
    expect(num_ja.ja_num("負の廿")).toBe(-20);
    expect(num_ja.ja_num("一萬阡陌拾")).toBe(11110);
    expect(num_ja.ja_num("じゅうにおくさんぜんよんひゃくまん")).toBe(1234000000);
    expect(num_ja.ja_num("ごじゅうろくまんななせんはっぴゃく")).toBe(567800);
    expect(num_ja.ja_num("にせんとんでにじゅう")).toBe(2020);
  });
  