BIND 10 #1971: untested cases in RBtree previousNode

[BIND 10 Development]

#1971: untested cases in RBtree previousNode
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:
           Component:  data source   |  Sprint-20120515
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 As I commented in #1803, there seem to be some untested cases:
 http://bind10.isc.org/ticket/1803#comment:6

 I've copied a lcov result at:
 http://bind10.isc.org/~jinmei/datasrc-lcov/datasrc/rbtree.h.gcov.html

 Please make sure these are covered.  While I don't think this is a
 blocking issue that requires reverting the feature, I'd like to make
 100% sure all parts are definitely covered by tests because this is
 important and complicated code.

 I'm pushing this to the current sprint as a remaining task of #1803.

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Ticket URL: <http://bind10.isc.org/ticket/1971>
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