The ModelFieldSelector keeps an internal cache for the fields_get.
This cache needs to be cleared in the tests environment because
a model with the same name may be defined several times accross the
tests modules, but they may contain different fields.
This could also be a problem with studio: when a field is created,
the ModelFieldSelector cache must be cleared as well (in addition
to the data_manager one).
We thus introduce a new 'clear_cache' event on core.bus. When
triggered, the ModelFieldSelector and the data_manager clear their
respective cache.
We use this event in the test environment to ensure that the cache
is cleared at the end of each test using a mockEnvironment. This
rev. also fixes an infinite loop in the override of destroy() in
the mockEnvironment, which occured when both session and config
were specified in the params.
Aaron Bohy
79e4a1f1b1