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

```
import copy
```

from django.contrib.gis.db.models import GeometryField

from django.contrib.gis.db.models.sql import AreaField, DistanceField

```
from django.test import SimpleTestCase
```
```
class FieldsTests(SimpleTestCase):
```

    def test_area_field_deepcopy(self):

```
        field = AreaField(None)
```

        self.assertEqual(copy.deepcopy(field), field)

    def test_distance_field_deepcopy(self):

```
        field = DistanceField(None)
```

        self.assertEqual(copy.deepcopy(field), field)

class GeometryFieldTests(SimpleTestCase):

```
    def test_deconstruct_empty(self):
```
```
        field = GeometryField()
```

        *_, kwargs = field.deconstruct()

        self.assertEqual(kwargs, {"srid": 4326})

```
    def test_deconstruct_values(self):
```
```
        field = GeometryField(
```
```
            srid=4067,
```
```
            dim=3,
```
```
            geography=True,
```
```
            extent=(
```
```
                50199.4814,
```
```
                6582464.0358,
```
```
                -50000.0,
```
```
                761274.6247,
```
```
                7799839.8902,
```
```
                50000.0,
```
```
            ),
```
```
            tolerance=0.01,
```
```
        )
```

        *_, kwargs = field.deconstruct()

```
        self.assertEqual(
```
```
            kwargs,
```
```
            {
```
```
                "srid": 4067,
```
```
                "dim": 3,
```
```
                "geography": True,
```
```
                "extent": (
```
```
                    50199.4814,
```
```
                    6582464.0358,
```
```
                    -50000.0,
```
```
                    761274.6247,
```
```
                    7799839.8902,
```
```
                    50000.0,
```
```
                ),
```
```
                "tolerance": 0.01,
```
```
            },
```
```
        )
```

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