[Checkins] [zopefoundation/zope.testrunner] ce9cd9: Fix FutureWarning on Python 3.8

[Marius Gedminas]

  Branch: refs/heads/py38
  Home:   https://github.com/zopefoundation/zope.testrunner
  Commit: ce9cd9dbe111fbfb62a533feddb3dd9f3adde0ba
      https://github.com/zopefoundation/zope.testrunner/commit/ce9cd9dbe111fbfb62a533feddb3dd9f3adde0ba
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-02-12 (Tue, 12 Feb 2019)

  Changed paths:
    M src/zope/testrunner/tests/testrunner-colors.rst

  Log Message:
  -----------
  Fix FutureWarning on Python 3.8

<doctest testrunner-colors.rst[5]>:2: FutureWarning: Possible nested set at position 2
  _color_regexp = re.compile('\033[[]([0-9;]*)m')


  Commit: 32575171f39ef6d1203bd3a839e7431aa3b384ec
      https://github.com/zopefoundation/zope.testrunner/commit/32575171f39ef6d1203bd3a839e7431aa3b384ec
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-02-12 (Tue, 12 Feb 2019)

  Changed paths:
    M src/zope/testrunner/tests/testrunner-colors.rst

  Log Message:
  -----------
  Do not make assertions about stdlib's doctest.py

The source code in stdlib's doctest.py changed between Python 3.7 and
3.8 sufficiently to break even the cut down assertion we already have.

      {red}      File ".../lib/python3.8/doctest.py", Line NNN, in __run{normal}
    - {red}        compileflags, 1)...{normal}
    + {red}        exec(compile(example.source, filename, "single",{normal}

I get the feeling Python 3.8 points to the first line in a multiline
statement in tracebacks, whereas older Python versions usually pointed
to the last line.


  Commit: 0b3dbf2e5ade3708d7f22176f4251c4ebcd3ad2a
      https://github.com/zopefoundation/zope.testrunner/commit/0b3dbf2e5ade3708d7f22176f4251c4ebcd3ad2a
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-02-12 (Tue, 12 Feb 2019)

  Changed paths:
    M src/zope/testrunner/find.py
    M src/zope/testrunner/tests/testrunner-debugging-import-failure.rst

  Log Message:
  -----------
  Fix test failure on Python 3.8

As I mentioned in the previous commit, Python 3.8 prints the first line
of a multiline statement instead of the last line:

      TypeError: Invalid test_suite, None, in tests2
      > ...find.py(NNN)find_suites()
    - -> % (suite, module_name)
    + -> raise TypeError(
      (Pdb) c
      EndRun raised

We don't need to care about that if we convert this to a single-line
statement.


Compare: https://github.com/zopefoundation/zope.testrunner/compare/ce9cd9dbe111%5E...0b3dbf2e5ade