.

;-)

all the defined test cases fail, but all my random test cases pass...

It does yes. The above solution would return false in that case, as it isn't safe.

I think the pre-code is more than clear:

// this is your solution string (for example: "123")
var solution = ""; 

But if this kata gets more attention, I'll see if I can improve it even further.
Thank you

I assumed that you would normally rounded that way.

I have now added a note due to multiple desire with respect to the liter / gallon - problem.

Thanks for your feedback Matt - good spot!

Not sure about the issues, maybe you encountered a partially complete test suite, but I assume now everything is working, then: thanks for your feed!

Care to say a bit more about the broken tests? Also, calling an issue because the problem does not use the data structure you will use seems a bit excessive...

I have added two test cases for each sex. Thank you for the suggestion!

fixed

My mistake, you got the old version of the example test cases (the full tests pass without problems); copy&paste this in your window, if you wish:

Test.describe("Basic tests",_=>{
s1 = 'Tadashi Takahiro Takao Takashi Takayuki Takehiko Takeo Takeshi Takeshi';
lst1 = ['Takehiko','Takayuki','Takahiro','Takeshi','Takeshi','Takashi','Tadashi','Takeo','Takao'];
Test.assertSimilar(lineupStudents(s1), (lst1));

s2 = 'Michio Miki Mikio Minori Minoru Mitsuo Mitsuru Nao Naoki Naoko Noboru Nobu Nobuo ,Nobuyuki Nori Norio Osamu Rafu Raiden Ringo Rokuro Ronin Ryo Ryoichi Ryota Ryozo Ryuichi Ryuu Saburo Sadao Samuru Satoru Satoshi Seiichi Seiji Senichi Shichiro Shig Shigekazu Shigeo Shigeru Shima Shin Shinichi Shinji Shiro Shoichi Shoji Shuichi Shuji Shunichi Susumu Tadao Tadashi Takahiro Takao Takashi Takayuki Takehiko Takeo Takeshi Takeshi Takumi Tama Tamotsu Taro Tatsuo Tatsuya Teruo Tetsip Tetsuya Tomi Tomio Toru Toshi Toshiaki Toshihiro Toshio Toshiyuki Toyo Tsuneo Tsutomu Tsuyoshi Uyeda Yasahiro Yasuhiro Yasuo Yasushi Yemon Yogi Yoichi Yori Yoshi Yoshiaki Yoshihiro Yoshikazu Yoshimitsu Yoshinori Yoshio Yoshiro Yoshito Yoshiyuki Yuichi Yuji Yuki';
lst2 =['Yoshimitsu', 'Yoshiyuki', 'Yoshinori', 'Yoshikazu', 'Yoshihiro',
 'Toshiyuki', 'Toshihiro', 'Shigekazu', ',Nobuyuki', 'Yoshiaki', 'Yasuhiro',
 'Yasahiro', 'Tsuyoshi', 'Toshiaki', 'Takehiko', 'Takayuki', 'Takahiro',
 'Shunichi', 'Shinichi', 'Shichiro', 'Yoshito', 'Yoshiro', 'Yasushi',
 'Tsutomu', 'Tetsuya', 'Tatsuya', 'Tamotsu', 'Takeshi', 'Takeshi', 'Takashi',
 'Tadashi', 'Shuichi', 'Shoichi', 'Shigeru', 'Senichi', 'Seiichi', 'Satoshi',
 'Ryuichi', 'Ryoichi', 'Mitsuru', 'Yuichi', 'Yoshio', 'Yoichi', 'Tsuneo',
 'Toshio', 'Tetsip', 'Tatsuo', 'Takumi', 'Susumu', 'Shinji', 'Shigeo',
 'Satoru', 'Samuru', 'Saburo', 'Rokuro', 'Raiden', 'Noboru', 'Mitsuo',
 'Minoru', 'Minori', 'Michio', 'Yoshi', 'Yemon', 'Yasuo', 'Uyeda', 'Toshi',
 'Tomio', 'Teruo', 'Takeo', 'Takao', 'Tadao', 'Shuji', 'Shoji', 'Shiro',
 'Shima', 'Seiji', 'Sadao', 'Ryozo', 'Ryota', 'Ronin', 'Ringo', 'Osamu',
 'Norio', 'Nobuo', 'Naoko', 'Naoki', 'Mikio', 'Yuki', 'Yuji', 'Yori', 'Yogi',
 'Toyo', 'Toru', 'Tomi', 'Taro', 'Tama', 'Shin', 'Shig', 'Ryuu', 'Rafu',
 'Nori', 'Nobu', 'Miki', 'Ryo', 'Nao'];
Test.assertSimilar(lineupStudents(s2), (lst2));
})

one char can not use twice, if chars="goatcode", when you got a dog, chars left "atcoe".