[Checkins] [zopefoundation/BTrees] 106c63: Start relying on the datatype to provide examples.

[Jason Madden]

  Branch: refs/heads/reduce-boilerplate
  Home:   https://github.com/zopefoundation/BTrees
  Commit: 106c632dab3ff4959180c668e8ac4224d40be62b
      https://github.com/zopefoundation/BTrees/commit/106c632dab3ff4959180c668e8ac4224d40be62b
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-02-21 (Fri, 21 Feb 2020)

  Changed paths:
    M BTrees/_datatypes.py
    M BTrees/tests/_test_builder.py
    M BTrees/tests/test_IFBTree.py
    M BTrees/tests/test_LFBTree.py
    M BTrees/tests/test_LLBTree.py

  Log Message:
  -----------
  Start relying on the datatype to provide examples.

This lets us convert LLBTree, IF and LF tests.