diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index 79ae64f03b..dbed0fb41a 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -2,8 +2,7 @@ project(sulvim_core)
 cmake_minimum_required(VERSION 3.16)
 set( CMAKE_CXX_STANDARD 17 )
 set( CMAKE_CXX_STANDARD_REQUIRED on )
-
-
+set (CMAKE_MODULE_PATH "${CMAKE_MODULE_PATH};${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include_directories(src)
 add_subdirectory(src)
 add_subdirectory(unittest)
diff --git a/core/cmake/FindGTest.cmake b/core/cmake/FindGTest.cmake
new file mode 100644
index 0000000000..53640adc6c
--- /dev/null
+++ b/core/cmake/FindGTest.cmake
@@ -0,0 +1,43 @@
+########################### GTEST
+# Enable ExternalProject CMake module
+INCLUDE(ExternalProject)
+
+# Set default ExternalProject root directory
+SET_DIRECTORY_PROPERTIES(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/third_party)
+
+# Add gtest
+# http://stackoverflow.com/questions/9689183/cmake-googletest
+ExternalProject_Add(
+    googletest
+    URL http://ss2.fluorinedog.com/data/gtest_v1.10.x.zip
+    # TIMEOUT 10
+    # # Force separate output paths for debug and release builds to allow easy
+    # # identification of correct lib in subsequent TARGET_LINK_LIBRARIES commands
+    # CMAKE_ARGS -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG:PATH=DebugLibs
+    #            -DCMAKE_ARCHIVE_OUTPUT_DIRECTORY_RELEASE:PATH=ReleaseLibs
+    #            -Dgtest_force_shared_crt=ON
+    # Disable install step
+    INSTALL_COMMAND ""
+    # Wrap download, configure and build steps in a script to log output
+    LOG_DOWNLOAD ON
+    LOG_CONFIGURE ON
+    LOG_BUILD ON)
+
+# Specify include dir
+ExternalProject_Get_Property(googletest source_dir)
+set(GTEST_INCLUDE_DIR ${source_dir}/include)
+
+# Library
+ExternalProject_Get_Property(googletest binary_dir)
+
+# set(GTEST_LIBRARY_PATH ${binary_dir}/lib/${CMAKE_FIND_LIBRARY_PREFIXES}gtest.a)
+# set(GTEST_LIBRARY gtest)
+# add_library(${GTEST_LIBRARY} UNKNOWN IMPORTED)
+# set_property(TARGET ${GTEST_LIBRARY} PROPERTY IMPORTED_LOCATION
+#                 ${GTEST_LIBRARY_PATH} )
+# add_dependencies(${GTEST_LIBRARY} googletest)
+set(GTEST_LIBRARY_PATH ${binary_dir}/lib)
+add_library(gtest UNKNOWN IMPORTED)
+add_library(gtest_main UNKNOWN IMPORTED)
+set_property(TARGET gtest PROPERTY IMPORTED_LOCATION ${GTEST_LIBRARY_PATH}/libgtest.a)
+set_property(TARGET gtest_main PROPERTY IMPORTED_LOCATION ${GTEST_LIBRARY_PATH}/libgtest_main.a)
diff --git a/core/src/dog_segment/CMakeLists.txt b/core/src/dog_segment/CMakeLists.txt
index 4f0744641e..e258c28ba9 100644
--- a/core/src/dog_segment/CMakeLists.txt
+++ b/core/src/dog_segment/CMakeLists.txt
@@ -7,4 +7,4 @@ add_library(milvus_dog_segment
     ${DOG_SEGMENT_FILES}
 )
 #add_dependencies( segment sqlite mysqlpp )
-target_link_libraries(milvus_dog_segment tbb milvus_utils)
\ No newline at end of file
+target_link_libraries(milvus_dog_segment tbb milvus_utils pthread)
\ No newline at end of file
diff --git a/core/unittest/CMakeLists.txt b/core/unittest/CMakeLists.txt
index e69de29bb2..5c07c0d9b4 100644
--- a/core/unittest/CMakeLists.txt
+++ b/core/unittest/CMakeLists.txt
@@ -0,0 +1,15 @@
+enable_testing()
+find_package(GTest REQUIRED)
+set(MILVUS_TEST_FILES
+    test_dog_segment.cpp
+)
+add_executable(all_tests 
+    ${MILVUS_TEST_FILES}
+)
+
+target_link_libraries(all_tests 
+    gtest 
+    gtest_main
+    milvus_dog_segment
+    pthread
+)
\ No newline at end of file
diff --git a/core/unittest/test_dog_segment.cpp b/core/unittest/test_dog_segment.cpp
index 7a89a9f461..e0fa51d68b 100644
--- a/core/unittest/test_dog_segment.cpp
+++ b/core/unittest/test_dog_segment.cpp
@@ -26,14 +26,16 @@
 // #include "segment/SegmentWriter.h"
 // #include "src/dog_segment/SegmentBase.h"
 // #include "utils/Json.h"
+#include <random>
+#include <gtest/gtest.h>
 #include "dog_segment/SegmentBase.h"
 using std::cin;
 using std::cout;
 using std::endl;
 
-using SegmentVisitor = milvus::engine::SegmentVisitor;
+// using SegmentVisitor = milvus::engine::SegmentVisitor;
 
-namespace {
+// namespace {
 // milvus::Status
 // CreateCollection(std::shared_ptr<DB> db, const std::string& collection_name, const LSN_TYPE& lsn) {
 //     CreateCollectionContext context;
@@ -73,7 +75,7 @@ namespace {
 // }
 // }  // namespace
 
-TEST_F(DogSegmentTest, TestABI) {
+TEST(DogSegmentTest, TestABI) {
     using namespace milvus::engine;
     using namespace milvus::dog_segment;
     ASSERT_EQ(TestABI(), 42);
@@ -135,7 +137,7 @@ TEST_F(DogSegmentTest, TestABI) {
 
 
 
-TEST_F(DogSegmentTest, MockTest) {
+TEST(DogSegmentTest, MockTest) {
     using namespace milvus::dog_segment;
     using namespace milvus::engine;
     auto schema = std::make_shared<Schema>();