[tor-bugs] #20489 [Metrics/CollecTor]: add tests for CollecTor

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#20489: add tests for CollecTor
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     Reporter:  iwakeh             |      Owner:
         Type:  enhancement        |     Status:  new
     Priority:  Medium             |  Milestone:
    Component:  Metrics/CollecTor  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 For all issues fixed during system test of the sync-release (#18910):

 * verify that there are tests checking the fixed functionality (where it
 makes sense)
 * add tests to catch similar issues with junit test instead of system
 testing (where feasible)

 At least for comments 82, 95, 98 in #18910.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20489>
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