[metrics-bugs] #20668 [Metrics/Onionoo]: make test-sources comply to checkstyle

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#20668: make test-sources comply to checkstyle
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     Reporter:  iwakeh           |      Owner:  metrics-team
         Type:  enhancement      |     Status:  new
     Priority:  Medium           |  Milestone:  Onionoo 3.1-1.0.0
    Component:  Metrics/Onionoo  |    Version:
     Severity:  Normal           |   Keywords:
Actual Points:                   |  Parent ID:
       Points:                   |   Reviewer:
      Sponsor:                   |
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 This [https://gitweb.torproject.org/user/iwakeh/onionoo.git/commit/?h
 =task-checkstyle-for-tests branch] already the build file changes.

 Now I'm going to take a look at the 199 complaints.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20668>
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