diff --git a/cpp/unittest/db/db_tests.cpp b/cpp/unittest/db/db_tests.cpp
index a8f5d2bf8d..c9a9d89780 100644
--- a/cpp/unittest/db/db_tests.cpp
+++ b/cpp/unittest/db/db_tests.cpp
@@ -204,11 +204,21 @@ TEST_F(DBTest, SEARCH_TEST) {
         ASSERT_STATS(stat);
     }
 
-    sleep(2); // wait until build index finish
+    db_->BuildIndex(TABLE_NAME); // wait until build index finish
 
-    engine::QueryResults results;
-    stat = db_->Query(TABLE_NAME, k, nq, xq.data(), results);
-    ASSERT_STATS(stat);
+    {
+        engine::QueryResults results;
+        stat = db_->Query(TABLE_NAME, k, nq, xq.data(), results);
+        ASSERT_STATS(stat);
+    }
+
+    {//search by specify index file
+        engine::meta::DatesT dates;
+        std::vector<std::string> file_ids = {"1", "2", "3", "4"};
+        engine::QueryResults results;
+        stat = db_->Query(TABLE_NAME, file_ids, k, nq, xq.data(), dates, results);
+        ASSERT_STATS(stat);
+    }
 
     // TODO(linxj): add groundTruth assert
 };
diff --git a/cpp/unittest/db/misc_test.cpp b/cpp/unittest/db/misc_test.cpp
index 4356746fc2..9dd07fac8d 100644
--- a/cpp/unittest/db/misc_test.cpp
+++ b/cpp/unittest/db/misc_test.cpp
@@ -14,6 +14,7 @@
 #include "db/Options.h"
 #include "db/DBMetaImpl.h"
 #include "db/EngineFactory.h"
+#include "db/Utils.h"
 
 #include <vector>
 
@@ -134,4 +135,32 @@ TEST(DBMiscTest, META_TEST) {
     int delta = 10;
     engine::meta::DateT dt = impl.GetDate(tt, delta);
     ASSERT_GT(dt, 0);
+}
+
+TEST(DBMiscTest, UTILS_TEST) {
+    engine::DBMetaOptions options;
+    options.path = "/tmp/milvus_test/main";
+    options.slave_paths.push_back("/tmp/milvus_test/slave_1");
+    options.slave_paths.push_back("/tmp/milvus_test/slave_2");
+
+    const std::string TABLE_NAME = "test_tbl";
+    auto status =  engine::utils::CreateTablePath(options, TABLE_NAME);
+    ASSERT_TRUE(status.ok());
+    ASSERT_TRUE(boost::filesystem::exists(options.path));
+    for(auto& path : options.slave_paths) {
+       ASSERT_TRUE(boost::filesystem::exists(path));
+    }
+
+    engine::meta::TableFileSchema file;
+    file.id_ = 50;
+    file.table_id_ = TABLE_NAME;
+    file.file_type_ = 3;
+    file.date_ = 155000;
+    status = engine::utils::GetTableFilePath(options, file);
+    ASSERT_FALSE(status.ok());
+    ASSERT_TRUE(file.location_.empty());
+
+    status = engine::utils::DeleteTablePath(options, TABLE_NAME);
+    ASSERT_TRUE(status.ok());
+
 }
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