- Fix some other group_by clauses

- Fix garbage_collect for an empty list (fixes a test)
- Add a script which runs the full test suite against mysql and postgres (note: QueueTest's are broken for MySQL, but they obviously work in production, so they need to be fixed)

test/testconfig.py

@@ -1,3 +1,5 @@
+import os
+
 from datetime import datetime, timedelta
 
 from config import DefaultConfig
@@ -14,8 +16,11 @@ class FakeTransaction(object):
 class TestConfig(DefaultConfig):
   TESTING = True
 
-  DB_URI = 'sqlite:///:memory:'
-  DB_CONNECTION_ARGS = {}
+  DB_URI = os.environ.get('TEST_DATABASE_URI', 'sqlite:///:memory:')
+  DB_CONNECTION_ARGS = {
+    'threadlocals': True,
+    'autorollback': True
+  }
 
   @staticmethod
   def create_transaction(db):