Django testing and unique=True

Hi,
I have a problem with model testing. My test fails with error:
IntegrityError: duplicate key value violates unique constraint
"catalog_name_key"
DETAIL: Key (name)=(test_catalog1) already exists.

I have unique=True on name field.

class CatalogTestCase(unittest.TestCase):
def setUp(self):
self.catalog1 = Catalog.objects.create(name="test_catalog1",
title_ru="Test Catalog1")

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