Merged the signals and signals_regress test packages.

This patch also made the tests less likely to pollute the global state
in case of failure.

2 files changed, 204 insertions, 127 deletions

diff --git a/tests/signals/models.py b/tests/signals/models.py
index 765230a44e..2f76343ecf 100644
--- a/tests/signals/models.py
+++ b/tests/signals/models.py
@@ -23,3 +23,20 @@ class Car(models.Model):
 
     def __str__(self):
         return "%s %s" % (self.make, self.model)
+
+
+@python_2_unicode_compatible
+class Author(models.Model):
+    name = models.CharField(max_length=20)
+
+    def __str__(self):
+        return self.name
+
+
+@python_2_unicode_compatible
+class Book(models.Model):
+    name = models.CharField(max_length=20)
+    authors = models.ManyToManyField(Author)
+
+    def __str__(self):
+        return self.name
diff --git a/tests/signals/tests.py b/tests/signals/tests.py
index 1eb2ffb4a3..bb23cdbee4 100644
--- a/tests/signals/tests.py
+++ b/tests/signals/tests.py
@@ -5,173 +5,233 @@ from django.dispatch import receiver
 from django.test import TestCase
 from django.utils import six
 
-from .models import Person, Car
-
-
-# #8285: signals can be any callable
-class PostDeleteHandler(object):
-    def __init__(self, data):
-        self.data = data
-
-    def __call__(self, signal, sender, instance, **kwargs):
-        self.data.append(
-            (instance, instance.id is None)
-        )
-
-
-class MyReceiver(object):
-    def __init__(self, param):
-        self.param = param
-        self._run = False
-
-    def __call__(self, signal, sender, **kwargs):
-        self._run = True
-        signal.disconnect(receiver=self, sender=sender)
+from .models import Author, Book, Car, Person
 
 
 class SignalTests(TestCase):
-    def test_basic(self):
+
+    def setUp(self):
         # 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)
-        pre_signals = (
+        self.pre_signals = (
             len(signals.pre_save.receivers),
             len(signals.post_save.receivers),
             len(signals.pre_delete.receivers),
             len(signals.post_delete.receivers),
         )
 
+    def tearDown(self):
+        # Check that all our signals got disconnected properly.
+        post_signals = (
+            len(signals.pre_save.receivers),
+            len(signals.post_save.receivers),
+            len(signals.pre_delete.receivers),
+            len(signals.post_delete.receivers),
+        )
+        self.assertEqual(self.pre_signals, post_signals)
+
+    def test_save_signals(self):
         data = []
 
-        def pre_save_test(signal, sender, instance, **kwargs):
+        def pre_save_handler(signal, sender, instance, **kwargs):
             data.append(
                 (instance, kwargs.get("raw", False))
             )
-        signals.pre_save.connect(pre_save_test)
 
-        def post_save_test(signal, sender, instance, **kwargs):
+        def post_save_handler(signal, sender, instance, **kwargs):
             data.append(
                 (instance, kwargs.get("created"), kwargs.get("raw", False))
             )
-        signals.post_save.connect(post_save_test)
 
-        def pre_delete_test(signal, sender, instance, **kwargs):
+        signals.pre_save.connect(pre_save_handler)
+        signals.post_save.connect(post_save_handler)
+        try:
+            p1 = Person.objects.create(first_name="John", last_name="Smith")
+
+            self.assertEqual(data, [
+                (p1, False),
+                (p1, True, False),
+            ])
+            data[:] = []
+
+            p1.first_name = "Tom"
+            p1.save()
+            self.assertEqual(data, [
+                (p1, False),
+                (p1, False, False),
+            ])
+            data[:] = []
+
+            # Calling an internal method purely so that we can trigger a "raw" save.
+            p1.save_base(raw=True)
+            self.assertEqual(data, [
+                (p1, True),
+                (p1, False, True),
+            ])
+            data[:] = []
+
+            p2 = Person(first_name="James", last_name="Jones")
+            p2.id = 99999
+            p2.save()
+            self.assertEqual(data, [
+                (p2, False),
+                (p2, True, False),
+            ])
+            data[:] = []
+            p2.id = 99998
+            p2.save()
+            self.assertEqual(data, [
+                (p2, False),
+                (p2, True, False),
+            ])
+        finally:
+            signals.post_delete.disconnect(pre_save_handler)
+            signals.pre_delete.disconnect(post_save_handler)
+
+    def test_delete_signals(self):
+        data = []
+
+        def pre_delete_handler(signal, sender, instance, **kwargs):
             data.append(
                 (instance, instance.id is None)
             )
-        signals.pre_delete.connect(pre_delete_test)
 
-        post_delete_test = PostDeleteHandler(data)
-        signals.post_delete.connect(post_delete_test)
+        # #8285: signals can be any callable
+        class PostDeleteHandler(object):
+            def __init__(self, data):
+                self.data = data
+
+            def __call__(self, signal, sender, instance, **kwargs):
+                self.data.append(
+                    (instance, instance.id is None)
+                )
+        post_delete_handler = PostDeleteHandler(data)
+
+        signals.pre_delete.connect(pre_delete_handler)
+        signals.post_delete.connect(post_delete_handler)
+        try:
+            p1 = Person.objects.create(first_name="John", last_name="Smith")
+            p1.delete()
+            self.assertEqual(data, [
+                (p1, False),
+                (p1, False),
+            ])
+            data[:] = []
+
+            p2 = Person(first_name="James", last_name="Jones")
+            p2.id = 99999
+            p2.save()
+            p2.id = 99998
+            p2.save()
+            p2.delete()
+            self.assertEqual(data, [
+                (p2, False),
+                (p2, False)
+            ])
+            data[:] = []
+
+            self.assertQuerysetEqual(
+                Person.objects.all(), [
+                    "James Jones",
+                ],
+                six.text_type
+            )
+        finally:
+            signals.post_delete.disconnect(pre_delete_handler)
+            signals.pre_delete.disconnect(post_delete_handler)
+
+    def test_decorators(self):
+        data = []
 
-        # throw a decorator syntax receiver into the mix
         @receiver(signals.pre_save)
-        def pre_save_decorator_test(signal, sender, instance, **kwargs):
+        def decorated_handler(signal, sender, instance, **kwargs):
             data.append(instance)
 
         @receiver(signals.pre_save, sender=Car)
-        def pre_save_decorator_sender_test(signal, sender, instance, **kwargs):
+        def decorated_handler_with_sender_arg(signal, sender, instance, **kwargs):
             data.append(instance)
 
-        p1 = Person(first_name="John", last_name="Smith")
-        self.assertEqual(data, [])
-        p1.save()
-        self.assertEqual(data, [
-            (p1, False),
-            p1,
-            (p1, True, False),
-        ])
-        data[:] = []
-
-        p1.first_name = "Tom"
-        p1.save()
-        self.assertEqual(data, [
-            (p1, False),
-            p1,
-            (p1, False, False),
-        ])
-        data[:] = []
-
-        # Car signal (sender defined)
-        c1 = Car(make="Volkswagon", model="Passat")
-        c1.save()
-        self.assertEqual(data, [
-            (c1, False),
-            c1,
-            c1,
-            (c1, True, False),
-        ])
-        data[:] = []
-
-        # Calling an internal method purely so that we can trigger a "raw" save.
-        p1.save_base(raw=True)
-        self.assertEqual(data, [
-            (p1, True),
-            p1,
-            (p1, False, True),
-        ])
-        data[:] = []
-
-        p1.delete()
-        self.assertEqual(data, [
-            (p1, False),
-            (p1, False),
-        ])
-        data[:] = []
-
-        p2 = Person(first_name="James", last_name="Jones")
-        p2.id = 99999
-        p2.save()
-        self.assertEqual(data, [
-            (p2, False),
-            p2,
-            (p2, True, False),
-        ])
-        data[:] = []
-
-        p2.id = 99998
-        p2.save()
-        self.assertEqual(data, [
-            (p2, False),
-            p2,
-            (p2, True, False),
-        ])
-        data[:] = []
-
-        p2.delete()
-        self.assertEqual(data, [
-            (p2, False),
-            (p2, False)
-        ])
-
-        self.assertQuerysetEqual(
-            Person.objects.all(), [
-                "James Jones",
-            ],
-            six.text_type
-        )
+        try:
+            c1 = Car.objects.create(make="Volkswagon", model="Passat")
+            self.assertEqual(data, [c1, c1])
+        finally:
+            signals.post_delete.disconnect(decorated_handler)
+            signals.pre_delete.disconnect(decorated_handler_with_sender_arg, sender=Car)
 
-        signals.post_delete.disconnect(post_delete_test)
-        signals.pre_delete.disconnect(pre_delete_test)
-        signals.post_save.disconnect(post_save_test)
-        signals.pre_save.disconnect(pre_save_test)
-        signals.pre_save.disconnect(pre_save_decorator_test)
-        signals.pre_save.disconnect(pre_save_decorator_sender_test, sender=Car)
+    def test_save_and_delete_signals_with_m2m(self):
+        data = []
 
-        # Check that all our signals got disconnected properly.
-        post_signals = (
-            len(signals.pre_save.receivers),
-            len(signals.post_save.receivers),
-            len(signals.pre_delete.receivers),
-            len(signals.post_delete.receivers),
-        )
-        self.assertEqual(pre_signals, post_signals)
+        def pre_save_handler(signal, sender, instance, **kwargs):
+            data.append('pre_save signal, %s' % instance)
+            if kwargs.get('raw'):
+                data.append('Is raw')
+
+        def post_save_handler(signal, sender, instance, **kwargs):
+            data.append('post_save signal, %s' % instance)
+            if 'created' in kwargs:
+                if kwargs['created']:
+                    data.append('Is created')
+                else:
+                    data.append('Is updated')
+            if kwargs.get('raw'):
+                data.append('Is raw')
+
+        def pre_delete_handler(signal, sender, instance, **kwargs):
+            data.append('pre_save signal, %s' % instance)
+            data.append('instance.id is not None: %s' % (instance.id is not None))
+
+        def post_delete_handler(signal, sender, instance, **kwargs):
+            data.append('post_delete signal, %s' % instance)
+            data.append('instance.id is not None: %s' % (instance.id is not None))
+
+        signals.pre_save.connect(pre_save_handler)
+        signals.post_save.connect(post_save_handler)
+        signals.pre_delete.connect(pre_delete_handler)
+        signals.post_delete.connect(post_delete_handler)
+        try:
+            a1 = Author.objects.create(name='Neal Stephenson')
+            self.assertEqual(data, [
+                "pre_save signal, Neal Stephenson",
+                "post_save signal, Neal Stephenson",
+                "Is created"
+            ])
+            data[:] = []
+
+            b1 = Book.objects.create(name='Snow Crash')
+            self.assertEqual(data, [
+                "pre_save signal, Snow Crash",
+                "post_save signal, Snow Crash",
+                "Is created"
+            ])
+            data[:] = []
+
+            # Assigning and removing to/from m2m shouldn't generate an m2m signal.
+            b1.authors = [a1]
+            self.assertEqual(data, [])
+            b1.authors = []
+            self.assertEqual(data, [])
+        finally:
+            signals.post_delete.disconnect(pre_save_handler)
+            signals.pre_delete.disconnect(post_save_handler)
+            signals.post_save.disconnect(pre_delete_handler)
+            signals.pre_save.disconnect(post_delete_handler)
 
     def test_disconnect_in_dispatch(self):
         """
         Test that signals that disconnect when being called don't mess future
         dispatching.
         """
-        a, b = MyReceiver(1), MyReceiver(2)
+
+        class Handler(object):
+            def __init__(self, param):
+                self.param = param
+                self._run = False
+
+            def __call__(self, signal, sender, **kwargs):
+                self._run = True
+                signal.disconnect(receiver=self, sender=sender)
+
+        a, b = Handler(1), Handler(2)
         signals.post_save.connect(sender=Person, receiver=a)
         signals.post_save.connect(sender=Person, receiver=b)
         Person.objects.create(first_name='John', last_name='Smith')