[Checkins] [zopefoundation/Zope] 6bc4da: add test for `tal:switch` - to verify #862 (#865)

[Dieter Maurer]

  Branch: refs/heads/4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6bc4daed19134980a41b4185c7abdba5cd7ac1be
      https://github.com/zopefoundation/Zope/commit/6bc4daed19134980a41b4185c7abdba5cd7ac1be
  Author: Dieter Maurer <d-maurer at users.noreply.github.com>
  Date:   2020-07-06 (Mon, 06 Jul 2020)

  Changed paths:
    M CHANGES.rst
    M buildout.cfg
    A src/Products/PageTemplates/tests/input/switch.html
    A src/Products/PageTemplates/tests/output/switch.html
    M src/Products/PageTemplates/tests/testHTMLTests.py

  Log Message:
  -----------
  add test for `tal:switch` - to verify #862 (#865)

* add test for `tal:switch` - to verify #862

* - use a Chameleon checkout so the tests work

Co-authored-by: Jens Vagelpohl <jens at netz.ooo>