apparently shared cache is discouraged, and doesn't make sense anyways

ui/medashare/cli.py

@@ -1558,7 +1558,7 @@ class _TestCases(unittest.TestCase):
 		os.chdir(self.tempdir)
 
 		engine = create_engine(
-		    "sqlite+pysqlite:///memdb1?mode=memory&cache=shared",
+		    "sqlite+pysqlite:///memdb1?mode=memory",
 		    echo=_sql_verbose, future=True)
 
 		objst = ObjectStore(engine)