Provide new way to setup Django settings for tests

Instead of configuring Django settings within our code, we now provide a
test_settings module that can be used to run the test suite.

django_statsd/patches/__init__.py

@@ -1,27 +1,7 @@
 from django.conf import settings
 from django.utils.importlib import import_module
 
-# Workaround for tests.
-try:
-    minimal = {
-        'DATABASES': {
-            'default': {
-                'ENGINE': 'django.db.backends.sqlite3',
-                'NAME': 'mydatabase'
-            }
-        },
-        'ROOT_URLCONF': '',
-        'STATSD_CLIENT': 'django_statsd.clients.null',
-        'STATSD_PREFIX': None,
-        'METLOG': None
-    }
-
-    if not settings.configured:
-        settings.configure(**minimal)
-
-    patches = getattr(settings, 'STATSD_PATCHES', [])
-except ImportError:
-    patches = []
+patches = getattr(settings, 'STATSD_PATCHES', [])
 
 for patch in patches:
     import_module(patch).patch()

django_statsd/test_settings.py

@@ -0,0 +1,13 @@
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': 'mydatabase'
+    }
+}
+
+ROOT_URLCONF = ''
+STATSD_CLIENT = 'django_statsd.clients.null'
+STATSD_PREFIX = None,
+METLOG = None
+
+SECRET_KEY = 'secret'

docs/index.rst

@@ -308,6 +308,13 @@ do this by adding in the handler. For example in your logging configuration::
         },
     }
 
+Testing
+=======
+
+You can run tests with the following command:
+
+    DJANGO_SETTINGS_MODULE='django_statsd.test_settings' nosetests
+
 Nose
 ====