[Sqlalchemy-tickets] Issue #4249: Error when testing dialect with an exclusion (zzzeek/sqlalchemy)

[Patrick B. <iss...@bi...>]

New issue 4249: Error when testing dialect with an exclusion
https://bitbucket.org/zzzeek/sqlalchemy/issues/4249/error-when-testing-dialect-with-an

Patrick Buxton:

The error shown below is seen when testing a dialect with:
    @property
    def json_type(self):
        return exclusions.closed()

=================================== ERRORS ====================================
___________ ERROR at setup of JSONTest.test_crit_against_int_basic ____________
Traceback (most recent call last):
  File "C:\Users\pat\Anaconda2\lib\site-packages\sqlalchemy\testing\plugin\pytestplugin.py", line 173, in pytest_runtest_setup
    class_setup(item.parent.parent)
  File "C:\Users\pat\Anaconda2\lib\site-packages\sqlalchemy\testing\plugin\pytestplugin.py", line 206, in class_setup
    plugin_base.start_test_class(item.cls)
  File "C:\Users\pat\Anaconda2\lib\site-packages\sqlalchemy\testing\plugin\plugin_base.py", line 452, in start_test_class
    _do_skips(cls)
  File "C:\Users\pat\Anaconda2\lib\site-packages\sqlalchemy\testing\plugin\plugin_base.py", line 567, in _do_skips
    for config_obj in config.Config.all_configs()
  File "C:\Users\pat\Anaconda2\lib\site-packages\sqlalchemy\testing\plugin\plugin_base.py", line 567, in <genexpr>
    for config_obj in config.Config.all_configs()
TypeError: 'NoneType' object is not iterable

I'm working on two dialects with this skip in place and it doesn't affect one of them, but I have seen that other people have also had this issue. (https://github.com/gijzelaerr/sqlalchemy-monetdb/issues/30)

The easiest way to reproduce will be to run the dialect tests:

git clone gi...@gi...:PlaidCloud/sqlalchemy-hana.git
cd sqlalchemy-hana
python setup.py test

Just comment out line 62 in testing\provision.py if you don't have a HANA server to point at and you'll still get the error generated even if the tests fail.