Add test for redis type

Author: moznuy

tests/test_redis_type.py

@@ -0,0 +1,10 @@
+from aredis_om import redis
+from aredis_om._util import ASYNC_MODE
+
+
+def test_redis_type():
+    import redis as sync_redis
+    import redis.asyncio as async_redis
+
+    mapping = {True: async_redis, False: sync_redis}
+    assert mapping[ASYNC_MODE] is redis