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96 lines
3.8 KiB
Python
96 lines
3.8 KiB
Python
from __future__ import absolute_import
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from django.db import models
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from django.test import TestCase
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from .models import Author, Book
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class SignalsRegressTests(TestCase):
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"""
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Testing signals before/after saving and deleting.
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"""
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def get_signal_output(self, fn, *args, **kwargs):
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# Flush any existing signal output
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self.signal_output = []
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fn(*args, **kwargs)
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return self.signal_output
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def pre_save_test(self, signal, sender, instance, **kwargs):
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self.signal_output.append('pre_save signal, %s' % instance)
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if kwargs.get('raw'):
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self.signal_output.append('Is raw')
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def post_save_test(self, signal, sender, instance, **kwargs):
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self.signal_output.append('post_save signal, %s' % instance)
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if 'created' in kwargs:
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if kwargs['created']:
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self.signal_output.append('Is created')
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else:
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self.signal_output.append('Is updated')
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if kwargs.get('raw'):
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self.signal_output.append('Is raw')
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def pre_delete_test(self, signal, sender, instance, **kwargs):
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self.signal_output.append('pre_save signal, %s' % instance)
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self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
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def post_delete_test(self, signal, sender, instance, **kwargs):
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self.signal_output.append('post_delete signal, %s' % instance)
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self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
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def setUp(self):
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self.signal_output = []
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# Save up the number of connected signals so that we can check at the end
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# that all the signals we register get properly unregistered (#9989)
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self.pre_signals = (len(models.signals.pre_save.receivers),
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len(models.signals.post_save.receivers),
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len(models.signals.pre_delete.receivers),
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len(models.signals.post_delete.receivers))
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models.signals.pre_save.connect(self.pre_save_test)
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models.signals.post_save.connect(self.post_save_test)
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models.signals.pre_delete.connect(self.pre_delete_test)
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models.signals.post_delete.connect(self.post_delete_test)
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def tearDown(self):
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models.signals.post_delete.disconnect(self.post_delete_test)
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models.signals.pre_delete.disconnect(self.pre_delete_test)
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models.signals.post_save.disconnect(self.post_save_test)
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models.signals.pre_save.disconnect(self.pre_save_test)
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# Check that all our signals got disconnected properly.
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post_signals = (len(models.signals.pre_save.receivers),
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len(models.signals.post_save.receivers),
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len(models.signals.pre_delete.receivers),
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len(models.signals.post_delete.receivers))
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self.assertEqual(self.pre_signals, post_signals)
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def test_model_signals(self):
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""" Model saves should throw some signals. """
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a1 = Author(name='Neal Stephenson')
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self.assertEqual(self.get_signal_output(a1.save), [
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"pre_save signal, Neal Stephenson",
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"post_save signal, Neal Stephenson",
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"Is created"
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])
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b1 = Book(name='Snow Crash')
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self.assertEqual(self.get_signal_output(b1.save), [
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"pre_save signal, Snow Crash",
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"post_save signal, Snow Crash",
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"Is created"
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])
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def test_m2m_signals(self):
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""" Assigning and removing to/from m2m shouldn't generate an m2m signal """
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b1 = Book(name='Snow Crash')
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self.get_signal_output(b1.save)
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a1 = Author(name='Neal Stephenson')
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self.get_signal_output(a1.save)
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self.assertEqual(self.get_signal_output(setattr, b1, 'authors', [a1]), [])
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self.assertEqual(self.get_signal_output(setattr, b1, 'authors', []), [])
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