[Xapian-tickets] [Xapian] #759: Test MSet::snippet() with small and zero length

[Xapian]

#759: Test MSet::snippet() with small and zero length
-------------------------------+--------------------------
        Reporter:  olly        |      Owner:  olly
            Type:  defect      |     Status:  new
        Priority:  normal      |  Milestone:  1.4.x
       Component:  Test Suite  |    Version:  git master
        Severity:  normal      |   Keywords:  GoodFirstBug
      Blocked By:              |   Blocking:
Operating System:  All         |
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 We have a reasonable number of different tests of `MSet::snippet()` in
 `xapian-core/tests/api_snippets.cc` but none that tests what happens if
 the length is zero, or smaller than the length of any word in the text, or
 smaller than the `omit` string.

 Probably in such cases we should just return an empty snippet, but it
 would be good to check this happens (rather than an exception or undefined
 behaviour).  The `$truncate` feature in omega was [ticket:754 buggy in
 such cases].

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Ticket URL: <https://trac.xapian.org/ticket/759>
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