Viewing github.com/django/django-stable-4.1.x/tests/empty/tests.py

```
from django.test import TestCase
```
```
from .models import Empty
```
```
class EmptyModelTests(TestCase):
```
```
    def test_empty(self):
```
```
        m = Empty()
```
```
        self.assertIsNone(m.id)
```
```
        m.save()
```
```
        Empty.objects.create()
```

        self.assertEqual(len(Empty.objects.all()), 2)

```
        self.assertIsNotNone(m.id)
```
```
        existing = Empty(m.id)
```
```
        existing.save()
```

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