[tor-bugs] #27205 [Core Tor/Tor]: add unit test for double-voting

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#27205: add unit test for double-voting
------------------------------+--------------------------------
     Reporter:  cypherpunks3  |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:  Tor: 0.2.9.4-alpha
     Severity:  Normal        |   Keywords:  protover
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 `protover.c` has a comment about very important code that guards against
 double-voting:

 {{{
   smartlist_sort_strings(expanded);
   smartlist_uniq_strings(expanded); // This makes voting work. do not
 remove
 }}}

 But no test fails if this is removed.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27205>
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