django/tests/migrate_signals/tests.py

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from django.db.models import signals
from django.test import TestCase
from django.core import management
from django.utils import six
from . import models
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PRE_MIGRATE_ARGS = ['app', 'create_models', 'verbosity', 'interactive', 'db']
MIGRATE_DATABASE = 'default'
MIGRATE_VERBOSITY = 1
MIGRATE_INTERACTIVE = False
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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):
"""
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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):
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# Although test runner calls migrate for several databases,
# testing for only one of them is quite sufficient.
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if kwargs['db'] == MIGRATE_DATABASE:
self.call_counter = self.call_counter + 1
self.call_args = kwargs
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# we need to test only one call of migrate
signals.pre_migrate.disconnect(pre_migrate_receiver, sender=models)
# 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.
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# 3. Test runner calls migrate for create default database.
# 4. Test runner execute our unit test code.
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pre_migrate_receiver = OneTimeReceiver()
signals.pre_migrate.connect(pre_migrate_receiver, sender=models)
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class MigrateSignalTests(TestCase):
available_apps = [
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'migrate_signals',
]
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def test_pre_migrate_call_time(self):
self.assertEqual(pre_migrate_receiver.call_counter, 1)
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def test_pre_migrate_args(self):
r = PreMigrateReceiver()
signals.pre_migrate.connect(r, sender=models)
management.call_command('migrate', database=MIGRATE_DATABASE,
verbosity=MIGRATE_VERBOSITY, interactive=MIGRATE_INTERACTIVE,
load_initial_data=False, stdout=six.StringIO())
args = r.call_args
self.assertEqual(r.call_counter, 1)
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self.assertEqual(set(args), set(PRE_MIGRATE_ARGS))
self.assertEqual(args['app'], models)
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self.assertEqual(args['verbosity'], MIGRATE_VERBOSITY)
self.assertEqual(args['interactive'], MIGRATE_INTERACTIVE)
self.assertEqual(args['db'], 'default')