django/tests/check_framework/test_multi_db.py

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from django.db import connections, models
from django.test import TestCase, mock
from django.test.utils import isolate_apps, override_settings
class TestRouter:
"""
Routes to the 'other' database if the model name starts with 'Other'.
"""
def allow_migrate(self, db, app_label, model_name=None, **hints):
return db == ('other' if model_name.startswith('other') else 'default')
@override_settings(DATABASE_ROUTERS=[TestRouter()])
@isolate_apps('check_framework')
class TestMultiDBChecks(TestCase):
multi_db = True
def _patch_check_field_on(self, db):
return mock.patch.object(connections[db].validation, 'check_field')
def test_checks_called_on_the_default_database(self):
class Model(models.Model):
field = models.CharField(max_length=100)
model = Model()
with self._patch_check_field_on('default') as mock_check_field_default:
with self._patch_check_field_on('other') as mock_check_field_other:
model.check()
self.assertTrue(mock_check_field_default.called)
self.assertFalse(mock_check_field_other.called)
def test_checks_called_on_the_other_database(self):
class OtherModel(models.Model):
field = models.CharField(max_length=100)
model = OtherModel()
with self._patch_check_field_on('other') as mock_check_field_other:
with self._patch_check_field_on('default') as mock_check_field_default:
model.check()
self.assertTrue(mock_check_field_other.called)
self.assertFalse(mock_check_field_default.called)