use two db for two SyncCore
diff --git a/test/test-sync-core.cc b/test/test-sync-core.cc
index cdec04d..68cc69b 100644
--- a/test/test-sync-core.cc
+++ b/test/test-sync-core.cc
@@ -25,6 +25,8 @@
 BOOST_AUTO_TEST_CASE(SyncCoreTest)
 {
   string dir = "./SyncCoreTest";
+  string dir1 = "./SyncCoreTest/1";
+  string dir2 = "./SyncCoreTest/2";
   Name user1("/joker");
   Name loc1("/gotham1");
   Name user2("/darkknight");
@@ -42,9 +44,9 @@
     remove_all(d);
   }
 
-  SyncCore *core1 = new SyncCore(dir, user1, loc1, syncPrefix, bind(callback1, _1), c1, scheduler);
+  SyncCore *core1 = new SyncCore(dir1, user1, loc1, syncPrefix, bind(callback1, _1), c1, scheduler);
   usleep(10000);
-  SyncCore *core2 = new SyncCore(dir, user2, loc2, syncPrefix, bind(callback2, _1), c2, scheduler);
+  SyncCore *core2 = new SyncCore(dir2, user2, loc2, syncPrefix, bind(callback2, _1), c2, scheduler);
   usleep(10000);
 
   SyncState state;