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78 lines
2.6 KiB
Python
78 lines
2.6 KiB
Python
from django.apps import apps
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from django.core import management
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from django.db.models import signals
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from django.test import TestCase
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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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PRE_MIGRATE_ARGS = ['app_config', 'verbosity', 'interactive', 'using']
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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 PreMigrateReceiver(object):
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def __init__(self):
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self.call_counter = 0
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self.call_args = None
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def __call__(self, signal, sender, **kwargs):
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self.call_counter = 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):
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self.call_counter = 0
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self.call_args = None
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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 = 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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signals.pre_migrate.disconnect(pre_migrate_receiver, 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()
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signals.pre_migrate.connect(pre_migrate_receiver, sender=APP_CONFIG)
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class MigrateSignalTests(TestCase):
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available_apps = ['migrate_signals']
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def test_pre_migrate_call_time(self):
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self.assertEqual(pre_migrate_receiver.call_counter, 1)
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def test_pre_migrate_args(self):
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r = PreMigrateReceiver()
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signals.pre_migrate.connect(r, sender=APP_CONFIG)
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management.call_command('migrate', database=MIGRATE_DATABASE,
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verbosity=MIGRATE_VERBOSITY, interactive=MIGRATE_INTERACTIVE,
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load_initial_data=False, stdout=six.StringIO())
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args = r.call_args
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self.assertEqual(r.call_counter, 1)
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self.assertEqual(set(args), set(PRE_MIGRATE_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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