[td-225] enable the client unit test.

src/client/CMakeLists.txt

@@ -35,6 +35,8 @@ IF ((TD_LINUX_64) OR (TD_LINUX_32 AND TD_ARM))
   MESSAGE(STATUS "build version ${VERSION_INFO}")
   SET_TARGET_PROPERTIES(taos PROPERTIES VERSION ${VERSION_INFO} SOVERSION 1)
 
+  ADD_SUBDIRECTORY(tests)
+
 ELSEIF (TD_WINDOWS_64)
   INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/jni/windows)
   INCLUDE_DIRECTORIES(${TD_COMMUNITY_DIR}/deps/jni/windows/win32)

src/client/tests/CMakeLists.txt

+CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+PROJECT(TDengine)
+
+FIND_PATH(HEADER_GTEST_INCLUDE_DIR gtest.h /usr/include/gtest /usr/local/include/gtest)
+FIND_LIBRARY(LIB_GTEST_STATIC_DIR libgtest.a /usr/lib/ /usr/local/lib)
+
+IF (HEADER_GTEST_INCLUDE_DIR AND LIB_GTEST_STATIC_DIR)
+    MESSAGE(STATUS "gTest library found, build unit test")
+
+    INCLUDE_DIRECTORIES(${HEADER_GTEST_INCLUDE_DIR})
+    AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
+
+    ADD_EXECUTABLE(cliTest ${SOURCE_LIST})
+    TARGET_LINK_LIBRARIES(cliTest taos tutil common gtest pthread)
+ENDIF()
\ No newline at end of file