BIND 10 #2781: Stats.do_polling should have direct tests

[BIND 10 Development]

#2781: Stats.do_polling should have direct tests
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:         |             Milestone:  Next-Sprint-
  defect                             |  Proposed
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  Core
  statistics                         |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 It is currently only tested indirectly.  It should have direct
 unit tests.  I also suggest considering breaking it into a several
 methods.  It seems too big and does multiple things, and therefore
 is not very understandable.

 But in any case, please do not introduce any more reliance on threads.
 This task should be done after #2689.

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Ticket URL: <http://bind10.isc.org/ticket/2781>
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