https://bz.apache.org/SpamAssassin/show_bug.cgi?id=8224

            Bug ID: 8224
           Summary: Net::DNS::Namesserver API change breaks
                    t/dnsbl_subtests.t
           Product: Spamassassin
           Version: SVN Trunk (Latest Devel Version)
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Regression Tests
          Assignee: dev@spamassassin.apache.org
          Reporter: sid...@sidney.com
  Target Milestone: Undefined

Created attachment 5937
  --> https://bz.apache.org/SpamAssassin/attachment.cgi?id=5937&action=edit
Patch to fix bug

Net::DNS had some big changes between version 1.37 and 1.38, then a bit of
instability in the API in versions leading up to the current 1.44. First it
introduced a method start_server, then stop_server, and deprecated main_loop.
Some of the focus of the most recent versions was on getting it to work under
Windows. Net::DNS::Nameserver still does not seem to work completely reliably
in Windows, but the developer seems to have settled on the current state as
good enough.

For our purposes, we only make use of Net::DNS::Nameserver to set up a local
nameserver on 127.0.0.1 for testing in t/dnsbl_subtests.t. It is sufficient to
not run those tests on Windows with the newer versions of Net::DNS that break.
There does not seem to be a problem with the use of Net::DNS anywhere in
SpamAssassin itself.

The attached patch modifies t/dnsbl_subtests.t so it checks for the methods
added by the various API changes and runs the test nameserver accordingly. It
also skip running when under Windows with an incompatible version of
Net::DNS::Nameserver, as determined by the existence of the newer methods
rather than checking the version number.

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