Are data created by setUpTestData shared by all tests ?

Hi,

I have an hard time understanding how I am supposed to use setUpTestData. The documentation isn't very clear about it (https://docs.djangoproject.com/en/1.8/topics/testing/tools/#django.test.TestCase.setUpTestData).

"The class-level atomic block described above allows the creation of initial data at the class level, once for the whole TestCase.". and "Note that if the tests are run on a database with no transaction support (for instance, MySQL with the MyISAM engine), setUpTestData() will be called before each test, negating the speed benefits." let me think that the changes made by the test should be rollbacked after each test.

So I would expect the following to works:

class OrderBugTest(TestCase):

    @classmethod

    def setUpTestData(cls):

        cls.order = OrderFactory()

        cls.order.go_available()

        cls.order.go_suspended()

    def test_1(self):

        """ Ok. """

        self.order.go_completed()

        self.assertEqual(self.order.state, 'completed')

    def test_2(self):

        """ Fails, order is modified from test_1. """

        self.assertEqual(self.order.state, 'suspended')

Does this means only static data should be created this way ? Can't I modify data created this way in the test ? Am I doing something wrong ?

Thanks.

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