[tor-bugs] #31516 [Core Tor/Tor]: config refactor: every function table entry should be unit tested

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#31516: config refactor: every function table entry should be unit tested
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     Reporter:  teor          |      Owner:  nickm
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  network-team-roadmap-august
Actual Points:                |  Parent ID:  #29211
       Points:                |   Reviewer:
      Sponsor:                |
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 We've added a lot of function tables, but some of their entries are all
 NULL, everywhere in the code.

 So even if it looks like we have 100% coverage, we're not testing these
 code paths.

 Ideally, we should have non-trivial functions, which do the thing that the
 function table entry is mean to do.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31516>
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