116 lines
4.6 KiB
Python
116 lines
4.6 KiB
Python
from django.apps import apps
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from django.core import management
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from django.db import migrations
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from django.db.models import signals
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from django.test import TransactionTestCase, override_settings
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from django.utils import six
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APP_CONFIG = apps.get_app_config('migrate_signals')
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SIGNAL_ARGS = ['app_config', 'verbosity', 'interactive', 'using', 'plan', 'apps']
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MIGRATE_DATABASE = 'default'
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MIGRATE_VERBOSITY = 1
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MIGRATE_INTERACTIVE = False
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class Receiver(object):
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def __init__(self, signal):
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self.call_counter = 0
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self.call_args = None
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signal.connect(self, sender=APP_CONFIG)
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def __call__(self, signal, sender, **kwargs):
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self.call_counter += 1
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self.call_args = kwargs
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class OneTimeReceiver(object):
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"""
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Special receiver for handle the fact that test runner calls migrate for
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several databases and several times for some of them.
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"""
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def __init__(self, signal):
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self.signal = signal
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self.call_counter = 0
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self.call_args = None
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self.signal.connect(self, sender=APP_CONFIG)
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def __call__(self, signal, sender, **kwargs):
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# Although test runner calls migrate for several databases,
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# testing for only one of them is quite sufficient.
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if kwargs['using'] == MIGRATE_DATABASE:
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self.call_counter += 1
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self.call_args = kwargs
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# we need to test only one call of migrate
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self.signal.disconnect(self, sender=APP_CONFIG)
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# We connect receiver here and not in unit test code because we need to
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# connect receiver before test runner creates database. That is, sequence of
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# actions would be:
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#
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# 1. Test runner imports this module.
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# 2. We connect receiver.
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# 3. Test runner calls migrate for create default database.
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# 4. Test runner execute our unit test code.
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pre_migrate_receiver = OneTimeReceiver(signals.pre_migrate)
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post_migrate_receiver = OneTimeReceiver(signals.post_migrate)
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class MigrateSignalTests(TransactionTestCase):
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available_apps = ['migrate_signals']
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def test_call_time(self):
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self.assertEqual(pre_migrate_receiver.call_counter, 1)
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self.assertEqual(post_migrate_receiver.call_counter, 1)
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def test_args(self):
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pre_migrate_receiver = Receiver(signals.pre_migrate)
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post_migrate_receiver = Receiver(signals.post_migrate)
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management.call_command(
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'migrate', database=MIGRATE_DATABASE, verbosity=MIGRATE_VERBOSITY,
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interactive=MIGRATE_INTERACTIVE, stdout=six.StringIO(),
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)
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for receiver in [pre_migrate_receiver, post_migrate_receiver]:
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args = receiver.call_args
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self.assertEqual(receiver.call_counter, 1)
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self.assertEqual(set(args), set(SIGNAL_ARGS))
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self.assertEqual(args['app_config'], APP_CONFIG)
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self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
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self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
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self.assertEqual(args['using'], 'default')
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self.assertEqual(args['plan'], [])
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self.assertIsInstance(args['apps'], migrations.state.StateApps)
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@override_settings(MIGRATION_MODULES={'migrate_signals': 'migrate_signals.custom_migrations'})
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def test_migrations_only(self):
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"""
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If all apps have migrations, migration signals should be sent.
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"""
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pre_migrate_receiver = Receiver(signals.pre_migrate)
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post_migrate_receiver = Receiver(signals.post_migrate)
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stdout = six.StringIO()
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management.call_command(
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'migrate', database=MIGRATE_DATABASE, verbosity=MIGRATE_VERBOSITY,
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interactive=MIGRATE_INTERACTIVE, stdout=stdout,
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)
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for receiver in [pre_migrate_receiver, post_migrate_receiver]:
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args = receiver.call_args
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self.assertEqual(receiver.call_counter, 1)
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self.assertEqual(set(args), set(SIGNAL_ARGS))
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self.assertEqual(args['app_config'], APP_CONFIG)
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self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
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self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
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self.assertEqual(args['using'], 'default')
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self.assertIsInstance(args['plan'][0][0], migrations.Migration)
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# The migration isn't applied backward.
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self.assertFalse(args['plan'][0][1])
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self.assertIsInstance(args['apps'], migrations.state.StateApps)
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self.assertEqual(pre_migrate_receiver.call_args['apps'].get_models(), [])
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self.assertEqual(
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[model._meta.label for model in post_migrate_receiver.call_args['apps'].get_models()],
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['migrate_signals.Signal']
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)
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