1 files changed, 95 insertions, 0 deletions
diff --git a/tests/signals_regress/tests.py b/tests/signals_regress/tests.py
new file mode 100644
index 0000000000..8fb3ad5a48
--- /dev/null
+++ b/tests/signals_regress/tests.py
@@ -0,0 +1,95 @@
+from __future__ import absolute_import
+
+from django.db import models
+from django.test import TestCase
+
+from .models import Author, Book
+
+
+class SignalsRegressTests(TestCase):
+    """
+    Testing signals before/after saving and deleting.
+    """
+
+    def get_signal_output(self, fn, *args, **kwargs):
+        # Flush any existing signal output
+        self.signal_output = []
+        fn(*args, **kwargs)
+        return self.signal_output
+
+    def pre_save_test(self, signal, sender, instance, **kwargs):
+        self.signal_output.append('pre_save signal, %s' % instance)
+        if kwargs.get('raw'):
+            self.signal_output.append('Is raw')
+
+    def post_save_test(self, signal, sender, instance, **kwargs):
+        self.signal_output.append('post_save signal, %s' % instance)
+        if 'created' in kwargs:
+            if kwargs['created']:
+                self.signal_output.append('Is created')
+            else:
+                self.signal_output.append('Is updated')
+        if kwargs.get('raw'):
+            self.signal_output.append('Is raw')
+
+    def pre_delete_test(self, signal, sender, instance, **kwargs):
+        self.signal_output.append('pre_save signal, %s' % instance)
+        self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
+
+    def post_delete_test(self, signal, sender, instance, **kwargs):
+        self.signal_output.append('post_delete signal, %s' % instance)
+        self.signal_output.append('instance.id is not None: %s' % (instance.id != None))
+
+    def setUp(self):
+        self.signal_output = []
+        # Save up the number of connected signals so that we can check at the end
+        # that all the signals we register get properly unregistered (#9989)
+        self.pre_signals = (len(models.signals.pre_save.receivers),
+                       len(models.signals.post_save.receivers),
+                       len(models.signals.pre_delete.receivers),
+                       len(models.signals.post_delete.receivers))
+
+        models.signals.pre_save.connect(self.pre_save_test)
+        models.signals.post_save.connect(self.post_save_test)
+        models.signals.pre_delete.connect(self.pre_delete_test)
+        models.signals.post_delete.connect(self.post_delete_test)
+
+    def tearDown(self):
+        models.signals.post_delete.disconnect(self.post_delete_test)
+        models.signals.pre_delete.disconnect(self.pre_delete_test)
+        models.signals.post_save.disconnect(self.post_save_test)
+        models.signals.pre_save.disconnect(self.pre_save_test)
+
+        # Check that all our signals got disconnected properly.
+        post_signals = (len(models.signals.pre_save.receivers),
+                        len(models.signals.post_save.receivers),
+                        len(models.signals.pre_delete.receivers),
+                        len(models.signals.post_delete.receivers))
+
+        self.assertEqual(self.pre_signals, post_signals)
+
+    def test_model_signals(self):
+        """ Model saves should throw some signals. """
+        a1 = Author(name='Neal Stephenson')
+        self.assertEqual(self.get_signal_output(a1.save), [
+            "pre_save signal, Neal Stephenson",
+            "post_save signal, Neal Stephenson",
+            "Is created"
+        ])
+
+        b1 = Book(name='Snow Crash')
+        self.assertEqual(self.get_signal_output(b1.save), [
+            "pre_save signal, Snow Crash",
+            "post_save signal, Snow Crash",
+            "Is created"
+        ])
+
+    def test_m2m_signals(self):
+        """ Assigning and removing to/from m2m shouldn't generate an m2m signal """
+
+        b1 = Book(name='Snow Crash')
+        self.get_signal_output(b1.save)
+        a1 = Author(name='Neal Stephenson')
+        self.get_signal_output(a1.save)
+        self.assertEqual(self.get_signal_output(setattr, b1, 'authors', [a1]), [])
+        self.assertEqual(self.get_signal_output(setattr, b1, 'authors', []), [])