[tor-bugs] #16021 [Tor]: Test: add unit test for rend_data_t create/free/dup/* functions.

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#16021: Test: add unit test for rend_data_t create/free/dup/* functions.
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 Reporter:  dgoulet                     |          Owner:
     Type:  enhancement                 |         Status:  new
 Priority:  normal                      |      Milestone:  Tor:
Component:  Tor                         |  0.2.7.x-final
 Keywords:  SponsorR, SponrorU, tor-hs  |        Version:
Parent ID:                              |  Actual Points:
                                        |         Points:
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 We've recently added `rend_data_service_create()` and
 `rend_data_client_create()` but without tests. Also, #15881 changed
 `rend_data_dup()` and `rend_data_free` a bit so we badly need unit testing
 for those to avoid future issue we might have by adding stuff to
 `rend_data_t`

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16021>
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