Added recursion test for the current bug in preview.

wiki/tests.py

-"""
-This file demonstrates writing tests using the unittest module. These will pass
-when you run "manage.py test".
+from django.contrib.auth.models import User
+from django.core.urlresolvers import reverse
+from django.test import TestCase
+from django.test.client import Client
 
-Replace this with more appropriate tests for your application.
-"""
+class WebClientTest(TestCase):
+    def test_preview_save(self):
+        """Test the basic operations (create, preview and save the article) by web client."""
+        c = Client()
+        User.objects.create_superuser('admin', 'nobody@example.com', 'secret')
+        c.login(username='admin', password='secret')
+        response = c.get(reverse('wiki:root'))  # url '/'
+        self.assertRedirects(response, reverse('wiki:root_create'))  # url '/create-root/'
 
-from django.test import TestCase
+        # test create the root article
+        response = c.post(reverse('wiki:root_create'),
+                {'content': 'test heading h1\n====\n', 'save_changes': 'Create root...', 'title': 'wiki test'})
+        self.assertRedirects(response, reverse('wiki:root'))
+        response = c.get(reverse('wiki:root'))
+        self.assertContains(response, 'test heading h1</h1>')
 
+        # test preview
+        form_data = {
+                'content': 'The modified text',
+                'current_revision': '1',
+                'preview': '1',
+                'save': '1',
+                'summary': 'any summary',
+                'title': 'wiki test'}
+        response = c.post(reverse('wiki:preview', kwargs={'path': ''}), form_data)  # url: '/_preview/'
+        self.assertContains(response, 'The modified text')  # preview failed
 
-class SimpleTest(TestCase):
-    def test_basic_addition(self):
-        """
-        Tests that 1 + 1 always equals 2.
-        """
-        self.assertEqual(1 + 1, 2)
+        # test save
+        response = c.post(reverse('wiki:edit', kwargs={'path': ''}), form_data)
+        message = c.cookies['messages'].value if 'messages' in c.cookies else None
+        self.assertRedirects(response, reverse('wiki:root'))
+        response = c.get(reverse('wiki:root'))
+        self.assertContains(response, 'The modified text')
+        # test messages
+        self.assertTrue('succesfully added' in message)