add functions for randomizations with their tests

[Remi-Gau]

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  Coverage          ?   11.11%           
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  Files             ?       39           
  Lines             ?      585           
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  Hits              ?       65           
  Misses            ?      520           
  Partials          ?        0           

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[marcobarilari]

lgtm, may you just add the new function in the docs?

[Remi-Gau]

lgtm, may you just add the new function in the docs?

I was too quick in merging. Will do it now.