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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
PRE_SYNCDB_ARGS = ['app', 'create_models', 'verbosity', 'interactive', 'db']
SYNCDB_DATABASE = 'default'
SYNCDB_VERBOSITY = 1
SYNCDB_INTERACTIVE = False
class PreSyncdbReceiver(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 syncdb 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 syncdb for several databases,
# testing for only one of them is quite sufficient.
if kwargs['db'] == SYNCDB_DATABASE:
self.call_counter = self.call_counter + 1
self.call_args = kwargs
# we need to test only one call of syncdb
signals.pre_syncdb.disconnect(pre_syncdb_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.
# 3. Test runner calls syncdb for create default database.
# 4. Test runner execute our unit test code.
pre_syncdb_receiver = OneTimeReceiver()
signals.pre_syncdb.connect(pre_syncdb_receiver, sender=models)
class SyncdbSignalTests(TestCase):
available_apps = [
'syncdb_signals',
]
def test_pre_syncdb_call_time(self):
self.assertEqual(pre_syncdb_receiver.call_counter, 1)
def test_pre_syncdb_args(self):
r = PreSyncdbReceiver()
signals.pre_syncdb.connect(r, sender=models)
management.call_command('syncdb', database=SYNCDB_DATABASE,
verbosity=SYNCDB_VERBOSITY, interactive=SYNCDB_INTERACTIVE,
load_initial_data=False, stdout=six.StringIO())
args = r.call_args
self.assertEqual(r.call_counter, 1)
self.assertEqual(set(args), set(PRE_SYNCDB_ARGS))
self.assertEqual(args['app'], models)
self.assertEqual(args['verbosity'], SYNCDB_VERBOSITY)
self.assertEqual(args['interactive'], SYNCDB_INTERACTIVE)
self.assertEqual(args['db'], 'default')
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