nice, clean and easy to read

Thanks. ;-)
Not too late, now I've added 1 fixed testcase like above, and rebuild the random tests.

There are solutions that past the test without checking if volume / n is an integer. I try this (27, 8) on some solutions and it passed like true.

This solution is not OK. Is not checking if volume divided by n is integers. If you try (27,8) your solution will return true, which is not correct.