[tor-bugs] #32300 [Circumvention/Snowflake]: Improve snowflake server test coverate

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#32300: Improve snowflake server test coverate
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 Reporter:  cohosh                   |          Owner:  cohosh
     Type:  defect                   |         Status:  assigned
 Priority:  Medium                   |      Milestone:
Component:  Circumvention/Snowflake  |        Version:
 Severity:  Normal                   |     Resolution:
 Keywords:                           |  Actual Points:
Parent ID:  #29259                   |         Points:
 Reviewer:                           |        Sponsor:
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Comment (by cohosh):

 Here's a start on a branch with more server tests:
 https://github.com/cohosh/snowflake/compare/server_tests

 I did the following minor refactor in the server:
 - allowed the passing in of a handler function in `initServer`

 Test coverage is currently at 27.3% which is a big improvement. I don't
 think we need close to 100% here, a lot of things are currently in the
 main function and some code can't be tested with unit tests (calls to
 goptlib functions). The server is pretty small and easy to maintain as it
 is so I don't want to mess around with it too much.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/32300#comment:1>
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