Use a file for sqlite in tests, in-memory seems to be seg-faulting

test/testconfig.py

@@ -1,6 +1,7 @@
 import os
 
 from datetime import datetime, timedelta
+from tempfile import NamedTemporaryFile
 
 from config import DefaultConfig
 
@@ -13,10 +14,13 @@ class FakeTransaction(object):
     pass
 
 
+TEST_DB_FILE = NamedTemporaryFile(delete=True)
+
+
 class TestConfig(DefaultConfig):
   TESTING = True
 
-  DB_URI = os.environ.get('TEST_DATABASE_URI', 'sqlite:///:memory:')
+  DB_URI = os.environ.get('TEST_DATABASE_URI', 'sqlite:///{0}'.format(TEST_DB_FILE.name))
   DB_CONNECTION_ARGS = {
     'threadlocals': True,
     'autorollback': True