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from django.apps import apps
from django.core import management
from django.db.models import signals
from django.test import override_settings, TestCase
from django.utils import six
APP_CONFIG = apps.get_app_config('migrate_signals')
PRE_MIGRATE_ARGS = ['app_config', 'verbosity', 'interactive', 'using']
MIGRATE_DATABASE = 'default'
MIGRATE_VERBOSITY = 1
MIGRATE_INTERACTIVE = False
class PreMigrateReceiver(object):
def __init__(self):
self.call_counter = 0
self.call_args = None
def __call__(self, signal, sender, **kwargs):
self.call_counter = self.call_counter + 1
self.call_args = kwargs
class OneTimeReceiver(object):
"""
Special receiver for handle the fact that test runner calls migrate for
several databases and several times for some of them.
"""
def __init__(self):
self.call_counter = 0
self.call_args = None
def __call__(self, signal, sender, **kwargs):
# Although test runner calls migrate for several databases,
# testing for only one of them is quite sufficient.
if kwargs['using'] == MIGRATE_DATABASE:
self.call_counter = self.call_counter + 1
self.call_args = kwargs
# we need to test only one call of migrate
signals.pre_migrate.disconnect(pre_migrate_receiver, sender=APP_CONFIG)
# We connect receiver here and not in unit test code because we need to
# connect receiver before test runner creates database. That is, sequence of
# actions would be:
#
# 1. Test runner imports this module.
# 2. We connect receiver.
# 3. Test runner calls migrate for create default database.
# 4. Test runner execute our unit test code.
pre_migrate_receiver = OneTimeReceiver()
signals.pre_migrate.connect(pre_migrate_receiver, sender=APP_CONFIG)
class MigrateSignalTests(TestCase):
available_apps = ['migrate_signals']
def test_pre_migrate_call_time(self):
self.assertEqual(pre_migrate_receiver.call_counter, 1)
def test_pre_migrate_args(self):
r = PreMigrateReceiver()
signals.pre_migrate.connect(r, sender=APP_CONFIG)
management.call_command('migrate', database=MIGRATE_DATABASE,
verbosity=MIGRATE_VERBOSITY, interactive=MIGRATE_INTERACTIVE,
stdout=six.StringIO())
args = r.call_args
self.assertEqual(r.call_counter, 1)
self.assertEqual(set(args), set(PRE_MIGRATE_ARGS))
self.assertEqual(args['app_config'], APP_CONFIG)
self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
self.assertEqual(args['using'], 'default')
@override_settings(MIGRATION_MODULES={'migrate_signals': 'migrate_signals.custom_migrations'})
def test_pre_migrate_migrations_only(self):
"""
If all apps have migrations, pre_migrate should be sent.
"""
r = PreMigrateReceiver()
signals.pre_migrate.connect(r, sender=APP_CONFIG)
stdout = six.StringIO()
management.call_command('migrate', database=MIGRATE_DATABASE,
verbosity=MIGRATE_VERBOSITY, interactive=MIGRATE_INTERACTIVE,
stdout=stdout)
args = r.call_args
self.assertEqual(r.call_counter, 1)
self.assertEqual(set(args), set(PRE_MIGRATE_ARGS))
self.assertEqual(args['app_config'], APP_CONFIG)
self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
self.assertEqual(args['using'], 'default')
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