Fix test failure if pytest's flaky plugin is installed

[mgorny]

Disable pytest's flaky plugin in test_simple_pytest_import_error_cli
in order to fix a test failure due to it mangling pytest's return code
on import error.

[Erotemic]

What environment was this error caused in? None of the dashboards seem to have caught it. I'm happy to merge this, but I'd also like to reproduce the error so I can understand it and prevent similar errors in the future.

(I'm also wondering why the CircleCI dashboards aren't running, but maybe they will if I merge this into the development branch for 0.15.9, probably a permission issue.).

[mgorny]

It happens if flaky is installed on the system. I suppose you could catch it via CI if you install that package in addition to the dependencies.

[Erotemic]

I was able to reproduce this. It looks like with flaky installed the error code returned is a 3 instead of 1:

===================================================================================== FAILURES =====================================================================================
_______________________________________________________________________ test_simple_pytest_import_error_cli ________________________________________________________________________

    def test_simple_pytest_import_error_cli():
        """
        This test case triggers an excessively long callback in xdoctest <
        dev/0.15.7
    
        xdoctest ~/code/xdoctest/testing/test_pytest_cli.py test_simple_pytest_import_error_cli
    
        import sys, ubelt
        sys.path.append(ubelt.expandpath('~/code/xdoctest/testing'))
        from test_pytest_cli import *  # NOQA
        """
        module_text = utils.codeblock(
            '''
            # There are lines before the bad line
            import os
            import sys
            import does_not_exist
    
            def module_func1():
                """
                This module has a doctest
    
                Example:
                    >>> print('hello world')
                """
            ''')
        temp_module = util_misc.TempModule(module_text, modname='imperr_test_mod')
        command = sys.executable + ' -m pytest -v -s --xdoctest-verbose=3 --xdoctest ' + temp_module.dpath
        print(command)
        info = cmd(command)
        print(info['out'])
    
        # info = cmd('pytest --xdoctest ' + temp_module.modpath)
        # print(info['out'])
    
>       assert info['ret'] == 1
E       assert 3 == 1

testing/test_pytest_cli.py:78: AssertionError
============================================================================= short test summary info ==============================================================================
FAILED testing/test_pytest_cli.py::test_simple_pytest_import_error_cli - assert 3 == 1
=========================================================================== 1 failed, 4 passed in 3.26s ============================================================================

Perhaps we could just change the assert to check that assert info['ret'] != 0 and not have to explicitly call out a specific plugin, which I would like to avoid, xdoctest should try to avoid conflicting with other established plugins.

[mgorny]

I'm happy with any solution that makes the tests pass.

[Erotemic]

If you make modify the PR to make that change I'll merge it and push out a new patch.

[Erotemic]

Thanks for this bug report! I pushed up the appropriate commits to this branch. Merging.

Do you need a new version of xdoctest with this fix released on pypi anytime soon? If so I can push one up and bump the patch version, if not I might wait a bit before making the new release.