I'm in the middle of trying to track down a problem with loading fixtures
during unit tests -- I'm hesitant to call it a bug in Django 1.7, but the
inconsistent behavior is really stumping me.
Essentially I've made a fixture via
manage dumpdata --indent=3 -e sessions -e admin -e contenttypes -e
auth.Permission > test-fixtures.json
If I add that fixtures to my TestCase, it sometimes works if I run each
test individually (using Django Nose) --
manage test --failfast test_it:TestClass.test_detail
manage test --failfast test_it:TestClass.test_list
But if I run them together,
manage test --failfast test_it:TestClass
I get errors about duplicate/unique problems. Essentially a row is
attempted to be added twice.
IntegrityError: Problem installing fixture 'test-fixtures.json': Could
not load app.Branch(pk=1): duplicate key value violates unique constraint
"app_branch_name_49810fc21046d2e2_uniq"
DETAIL: Key (name)=(mock) already exists.
(I've also posted this earlier today on django-users, where I also included
some postgres output). The tests within the TestCase (or
TransactionTestCase) can be empty ("pass") and still reproduce.
As best I can tell it doesn't only happen when combined -- sometimes I can
get it to happen in a class with a single TestCase. And it isn't always
the same model that has the conflict.
Has anyone seen anything like this behavior before? It's as if sometimes
the fixtures are installed in different order each time, which makes me
think of some dict.keys() that doesn't return the same order every time.
Rich
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