File: test_model_field_deprecation.py

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from django.core import checks
from django.db import models
from django.test import SimpleTestCase
from django.test.utils import isolate_apps


@isolate_apps('check_framework')
class TestDeprecatedField(SimpleTestCase):
    def test_default_details(self):
        class MyField(models.Field):
            system_check_deprecated_details = {}

        class Model(models.Model):
            name = MyField()

        model = Model()
        self.assertEqual(model.check(), [
            checks.Warning(
                msg='MyField has been deprecated.',
                obj=Model._meta.get_field('name'),
                id='fields.WXXX',
            )
        ])

    def test_user_specified_details(self):
        class MyField(models.Field):
            system_check_deprecated_details = {
                'msg': 'This field is deprecated and will be removed soon.',
                'hint': 'Use something else.',
                'id': 'fields.W999',
            }

        class Model(models.Model):
            name = MyField()

        model = Model()
        self.assertEqual(model.check(), [
            checks.Warning(
                msg='This field is deprecated and will be removed soon.',
                hint='Use something else.',
                obj=Model._meta.get_field('name'),
                id='fields.W999',
            )
        ])


@isolate_apps('check_framework')
class TestRemovedField(SimpleTestCase):
    def test_default_details(self):
        class MyField(models.Field):
            system_check_removed_details = {}

        class Model(models.Model):
            name = MyField()

        model = Model()
        self.assertEqual(model.check(), [
            checks.Error(
                msg='MyField has been removed except for support in historical migrations.',
                obj=Model._meta.get_field('name'),
                id='fields.EXXX',
            )
        ])

    def test_user_specified_details(self):
        class MyField(models.Field):
            system_check_removed_details = {
                'msg': 'Support for this field is gone.',
                'hint': 'Use something else.',
                'id': 'fields.E999',
            }

        class Model(models.Model):
            name = MyField()

        model = Model()
        self.assertEqual(model.check(), [
            checks.Error(
                msg='Support for this field is gone.',
                hint='Use something else.',
                obj=Model._meta.get_field('name'),
                id='fields.E999',
            )
        ])