Fixed #18408 -- Isolated flatpages tests from existing sites.

Resolves Flatpages test issues by:
 - Creating an example_site fixture
 - Overriding project SITE_ID setting to 1
 - Normalizing the use of the hardcoded (1) site_id to settings.SITE_ID

AUTHORS

@@ -401,6 +401,7 @@ answer newbie questions, and generally made Django that much better:
     Christian Oudard <christian.oudard@gmail.com>
     oggie rob <oz.robharvey@gmail.com>
     oggy <ognjen.maric@gmail.com>
+    Jens Page
     Jay Parlar <parlar@gmail.com>
     Carlos Eduardo de Paula <carlosedp@gmail.com>
     John Paulett <john@paulett.org>

django/contrib/flatpages/fixtures/example_site.json

+[
+  {
+    "pk": 1,
+    "model": "sites.site",
+    "fields": {
+      "domain": "example.com",
+      "name": "example.com"
+    }
+  }
+]
+

django/contrib/flatpages/tests/csrf.py

@@ -18,9 +18,10 @@ from django.test.utils import override_settings
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageCSRFTests(TestCase):
-    fixtures = ['sample_flatpages']
+    fixtures = ['sample_flatpages', 'example_site']
     urls = 'django.contrib.flatpages.tests.urls'
 
     def setUp(self):

django/contrib/flatpages/tests/forms.py

@@ -5,7 +5,10 @@ from django.test import TestCase
 from django.test.utils import override_settings
 from django.utils import translation
 
+@override_settings(SITE_ID=1)
 class FlatpageAdminFormTests(TestCase):
+    fixtures = ['example_site']
+
     def setUp(self):
         self.form_data = {
             'title': "A test page",
@@ -89,5 +92,5 @@ class FlatpageAdminFormTests(TestCase):
 
         self.assertEqual(
             f.errors,
-            {'sites': [u'This field is required.']})
+            {'sites': [translation.ugettext(u'This field is required.')]})
 

django/contrib/flatpages/tests/middleware.py

@@ -19,9 +19,10 @@ from django.test.utils import override_settings
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageMiddlewareTests(TestCase):
-    fixtures = ['sample_flatpages']
+    fixtures = ['sample_flatpages', 'example_site']
     urls = 'django.contrib.flatpages.tests.urls'
 
     def test_view_flatpage(self):
@@ -75,7 +76,7 @@ class FlatpageMiddlewareTests(TestCase):
             enable_comments=False,
             registration_required=False,
         )
-        fp.sites.add(1)
+        fp.sites.add(settings.SITE_ID)
 
         response = self.client.get('/some.very_special~chars-here/')
         self.assertEqual(response.status_code, 200)
@@ -96,9 +97,10 @@ class FlatpageMiddlewareTests(TestCase):
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageMiddlewareAppendSlashTests(TestCase):
-    fixtures = ['sample_flatpages']
+    fixtures = ['sample_flatpages', 'example_site']
     urls = 'django.contrib.flatpages.tests.urls'
 
     def test_redirect_view_flatpage(self):
@@ -130,7 +132,7 @@ class FlatpageMiddlewareAppendSlashTests(TestCase):
             enable_comments=False,
             registration_required=False,
         )
-        fp.sites.add(1)
+        fp.sites.add(settings.SITE_ID)
 
         response = self.client.get('/some.very_special~chars-here')
         self.assertRedirects(response, '/some.very_special~chars-here/', status_code=301)
@@ -144,7 +146,7 @@ class FlatpageMiddlewareAppendSlashTests(TestCase):
             enable_comments=False,
             registration_required=False,
         )
-        fp.sites.add(1)
+        fp.sites.add(settings.SITE_ID)
 
         response = self.client.get('/')
         self.assertEqual(response.status_code, 200)

django/contrib/flatpages/tests/templatetags.py

@@ -18,6 +18,7 @@ from django.test.utils import override_settings
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageTemplateTagTests(TestCase):
     fixtures = ['sample_flatpages']

django/contrib/flatpages/tests/views.py

@@ -19,9 +19,10 @@ from django.test.utils import override_settings
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageViewTests(TestCase):
-    fixtures = ['sample_flatpages']
+    fixtures = ['sample_flatpages', 'example_site']
     urls = 'django.contrib.flatpages.tests.urls'
 
     def test_view_flatpage(self):
@@ -85,9 +86,10 @@ class FlatpageViewTests(TestCase):
     TEMPLATE_DIRS=(
         os.path.join(os.path.dirname(__file__), 'templates'),
     ),
+    SITE_ID=1,
 )
 class FlatpageViewAppendSlashTests(TestCase):
-    fixtures = ['sample_flatpages']
+    fixtures = ['sample_flatpages', 'example_site']
     urls = 'django.contrib.flatpages.tests.urls'
 
     def test_redirect_view_flatpage(self):
@@ -119,7 +121,7 @@ class FlatpageViewAppendSlashTests(TestCase):
             enable_comments=False,
             registration_required=False,
         )
-        fp.sites.add(1)
+        fp.sites.add(settings.SITE_ID)
 
         response = self.client.get('/flatpage_root/some.very_special~chars-here')
         self.assertRedirects(response, '/flatpage_root/some.very_special~chars-here/', status_code=301)