I would remove the command and do something like:

```python
@override_settings(VARIFY_SAMPLE_DIRS=SAMPLE_DIRS)
class BigAutoFieldsTestCase(TestCase):
    def setUp(self):
        self.project = Project.create(...)
        self.batch = Batch.create(project_id=self.project.id, ...)

# Project and batch were created in setup so their IDs can be
# used when creating other objects below by referencing:
#    self.project.id       or      self.batch.id

....
```