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Thanks for the approval!

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Btw, nice kata!

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Btw, you forgot to initialize the random number generator. Just adding math.randomseed(os.time()) after the requires will do it.

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Btw, I don't know what's the expected length, but I managed to pass the tests with 158 chars.

Please use the busted library instead of plain asserts. You can compare two strings using assert.equals or assert.are.same.

Here's documentation for it: https://lunarmodules.github.io/busted/

Also get_lines can be written in O(n) as follows:

function get_lines(str)
  local lines = {}
  (str..'\n'):gsub('([^\n]*).', function(line) lines[#lines+1] = line end)
  return lines
end

Same with setify, it can be written in O(n) with:

function setify(t)
  local res, visited = {}, {}
  for _, v in ipairs(t) do
    if not visited[v] then
      res[#res+1] = v
      visited[v] = true
    end
  end
  return res
end

Btw, did you know in lua we have the pairs and ipairs functions?

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Thank you very much for the feedback and the test case, I've just added it!

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