Fix "the JSON object must be str, not 'bytes'" on python3.

Closes #82.

* Test mock API responses (with actual content) in admin tests.
  (This exposes failure case, at least under Python 3.4/Django 1.6.)
* Parse json from Response.text, rather than raw Response.content
  bytes, in admin views.

djrill/tests/test_admin.py

@@ -3,6 +3,7 @@ import sys
 from django.test import TestCase
 from django.contrib.auth.models import User
 from django.contrib import admin
+import six
 
 from djrill.tests.mock_backend import DjrillBackendMockAPITestCase
 
@@ -17,10 +18,6 @@ def reset_admin_site():
 class DjrillAdminTests(DjrillBackendMockAPITestCase):
     """Test the Djrill admin site"""
 
-    # These tests currently just verify that the admin site pages load
-    # without error -- they don't test any Mandrill-supplied content.
-    # (Future improvements could mock the Mandrill responses.)
-
     # These urls set up the DjrillAdminSite as suggested in the readme
     urls = 'djrill.tests.admin_urls'
 
@@ -39,24 +36,32 @@ class DjrillAdminTests(DjrillBackendMockAPITestCase):
         self.client.login(username='admin', password='secret')
 
     def test_admin_senders(self):
+        self.mock_post.return_value = self.MockResponse(raw=self.mock_api_content['users/senders.json'])
         response = self.client.get('/admin/djrill/senders/')
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Senders")
+        self.assertContains(response, "sender.example@mandrillapp.com")
 
     def test_admin_status(self):
+        self.mock_post.return_value = self.MockResponse(raw=self.mock_api_content['users/info.json'])
         response = self.client.get('/admin/djrill/status/')
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Status")
+        self.assertContains(response, "myusername")
 
     def test_admin_tags(self):
+        self.mock_post.return_value = self.MockResponse(raw=self.mock_api_content['tags/list.json'])
         response = self.client.get('/admin/djrill/tags/')
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "Tags")
+        self.assertContains(response, "example-tag")
 
     def test_admin_urls(self):
+        self.mock_post.return_value = self.MockResponse(raw=self.mock_api_content['urls/list.json'])
         response = self.client.get('/admin/djrill/urls/')
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, "URLs")
+        self.assertContains(response, "example.com/example-page")
 
     def test_admin_index(self):
         """Make sure Djrill section is included in the admin index page"""
@@ -65,6 +70,67 @@ class DjrillAdminTests(DjrillBackendMockAPITestCase):
         self.assertContains(response, "Djrill")
 
 
+    mock_api_content = {
+        'users/senders.json': six.b('''
+            [
+                {
+                    "address": "sender.example@mandrillapp.com",
+                    "created_at": "2013-01-01 15:30:27",
+                    "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                    "unsubs": 42, "opens": 42, "clicks": 42, "unique_opens": 42, "unique_clicks": 42
+                }
+            ]
+            '''),
+
+        'users/info.json': six.b('''
+            {
+                "username": "myusername",
+                "created_at": "2013-01-01 15:30:27",
+                "public_id": "aaabbbccc112233",
+                "reputation": 42,
+                "hourly_quota": 42,
+                "backlog": 42,
+                "stats": {
+                    "today": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 },
+                    "last_7_days": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 },
+                    "last_30_days": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 },
+                    "last_60_days": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 },
+                    "last_90_days": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 },
+                    "all_time": { "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                        "unsubs": 42, "opens": 42, "unique_opens": 42, "clicks": 42, "unique_clicks": 42 }
+                }
+            }
+            '''),
+
+        'tags/list.json': six.b('''
+            [
+                {
+                    "tag": "example-tag",
+                    "reputation": 42,
+                    "sent": 42, "hard_bounces": 42, "soft_bounces": 42, "rejects": 42, "complaints": 42,
+                    "unsubs": 42, "opens": 42, "clicks": 42, "unique_opens": 42, "unique_clicks": 42
+                }
+            ]
+            '''),
+
+        'urls/list.json': six.b('''
+            [
+                {
+                    "url": "http://example.com/example-page",
+                    "sent": 42,
+                    "clicks": 42,
+                    "unique_clicks": 42
+                }
+            ]
+            '''),
+    }
+
+
 class DjrillNoAdminTests(TestCase):
     def test_admin_autodiscover_without_djrill(self):
         """Make sure autodiscover doesn't die without DjrillAdminSite"""