Fixed #24965 -- Made LiveServerTestCase.live_server_url accessible from class

django/utils/decorators.py

@@ -144,3 +144,15 @@ if ContextDecorator is None:
                 with self:
                     return func(*args, **kwargs)
             return inner
+
+
+class classproperty(object):
+    def __init__(self, method=None):
+        self.fget = method
+
+    def __get__(self, instance, owner):
+        return self.fget(owner)
+
+    def getter(self, method):
+        self.fget = method
+        return self

docs/topics/testing/tools.txt

@@ -789,6 +789,12 @@ via the :djadminopt:`--liveserver` option, for example:
 
     $ ./manage.py test --liveserver=localhost:8082
 
+.. versionchanged:: 1.9
+
+    In older versions ``live_server_url`` could only be accessed from an
+    instance. It now is a class property and can be accessed from class methods
+    like ``setUpClass()``.
+
 Another way of changing the default server address is by setting the
 `DJANGO_LIVE_TEST_SERVER_ADDRESS` environment variable somewhere in your
 code (for example, in a :ref:`custom test runner<topics-testing-test_runner>`)::

tests/servers/tests.py

@@ -11,6 +11,7 @@ from django.core.exceptions import ImproperlyConfigured
 from django.test import LiveServerTestCase, override_settings
 from django.utils._os import upath
 from django.utils.http import urlencode
+from django.utils.six import text_type
 from django.utils.six.moves.urllib.error import HTTPError
 from django.utils.six.moves.urllib.request import urlopen
 
@@ -71,6 +72,9 @@ class LiveServerAddress(LiveServerBase):
         else:
             del os.environ['DJANGO_LIVE_TEST_SERVER_ADDRESS']
 
+        # put it in a list to prevent descriptor lookups in test
+        cls.live_server_url_test = [cls.live_server_url]
+
     @classmethod
     def tearDownClass(cls):
         # skip it, as setUpClass doesn't call its parent either
@@ -87,10 +91,9 @@ class LiveServerAddress(LiveServerBase):
         finally:
             super(LiveServerAddress, cls).tearDownClass()
 
-    def test_test_test(self):
+    def test_live_server_url_is_class_property(self):
-        # Intentionally empty method so that the test is picked up by the
+        self.assertIsInstance(self.live_server_url_test[0], text_type)
-        # test runner and the overridden setUpClass() method is executed.
+        self.assertEqual(self.live_server_url_test[0], self.live_server_url)
-        pass
 
 
 class LiveServerViews(LiveServerBase):

tests/utils_tests/test_decorators.py

@@ -2,7 +2,7 @@ from django.http import HttpResponse
 from django.template import engines
 from django.template.response import TemplateResponse
 from django.test import RequestFactory, SimpleTestCase
-from django.utils.decorators import decorator_from_middleware
+from django.utils.decorators import classproperty, decorator_from_middleware
 
 
 class ProcessViewMiddleware(object):
@@ -107,3 +107,41 @@ class DecoratorFromMiddlewareTests(SimpleTestCase):
         self.assertTrue(getattr(request, 'process_response_reached', False))
         # Check that process_response saw the rendered content
         self.assertEqual(request.process_response_content, b"Hello world")
+
+
+class ClassPropertyTest(SimpleTestCase):
+    def test_getter(self):
+        class Foo(object):
+            foo_attr = 123
+
+            def __init__(self):
+                self.foo_attr = 456
+
+            @classproperty
+            def foo(cls):
+                return cls.foo_attr
+
+        class Bar(object):
+            bar = classproperty()
+
+            @bar.getter
+            def bar(cls):
+                return 123
+
+        self.assertEqual(Foo.foo, 123)
+        self.assertEqual(Foo().foo, 123)
+        self.assertEqual(Bar.bar, 123)
+        self.assertEqual(Bar().bar, 123)
+
+    def test_override_getter(self):
+        class Foo(object):
+            @classproperty
+            def foo(cls):
+                return 123
+
+            @foo.getter
+            def foo(cls):
+                return 456
+
+        self.assertEqual(Foo.foo, 456)
+        self.assertEqual(Foo().foo, 456)