[PATCH 3/5] Rework configurable 'PW_TEST_DB_xxx' settings

[Stephen Finucane]

There are a number of environment variables that users can set to
configure different aspects of their testing environment. Rework these
like so:

* People use PostgreSQL, so make it as easy as possible for them to
  develop and test against it. Add a 'PW_TEST_DB_TYPE' setting
* Attempt to use defaults for the username and password in settings
* Allow the user to configure the database name, if they so wish

Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>
---
 patchwork/settings/dev.py | 9 ++++++---
 requirements-test.txt     | 1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/patchwork/settings/dev.py b/patchwork/settings/dev.py
index e93249c..0f73a13 100644
--- a/patchwork/settings/dev.py
+++ b/patchwork/settings/dev.py
@@ -35,12 +35,15 @@ DATABASES = {
         'ENGINE': 'django.db.backends.mysql',
         'HOST': 'localhost',
         'PORT': '',
-        'USER': os.environ['PW_TEST_DB_USER'],
-        'PASSWORD': os.environ['PW_TEST_DB_PASS'],
-        'NAME': 'patchwork',
+        'USER': os.getenv('PW_TEST_DB_USER', 'patchwork'),
+        'PASSWORD': os.getenv('PW_TEST_DB_PASS', 'password'),
+        'NAME': os.getenv('PW_TEST_DB_NAME', 'patchwork'),
     },
 }
 
+if os.getenv('PW_TEST_DB_TYPE', None) == 'postgre':
+    DATABASES['default']['ENGINE'] = 'django.db.backends.postgresql_psycopg2'
+
 if django.VERSION < (1, 7):
     DATABASES['default']['TEST_CHARSET'] = 'utf8'
 else:
diff --git a/requirements-test.txt b/requirements-test.txt
index 035ce13..e6c34ec 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,3 +1,4 @@
 MySQL-python==1.2.5
+psycopg2==2.6.1
 python-dateutil==1.5
 selenium
-- 
2.0.0