That test is failing on Django 1.9, that issue has been fixed on master
only as it touches a part of form validation that is too important to
touch for a stable release.
Thanks David Szotten for the report and Tommy Beadle for code inspiration.
Thanks Tim Graham for the review.
Partial backport of db19619545 from master.
Also added tests for HStoreField and JSONField.
Thanks Aleksey Bukin for the report and Tim Graham for the initial patch and
the review.
Backport of 928c12eb1 from master.