Improve robustness of tests/CMakeLists.txt

Author: ktchu

tests/CMakeLists.txt

@@ -20,12 +20,11 @@ function(add_test_target TEST_PROGRAM SOURCE_FILES)
     add_executable(${TEST_PROGRAM} ${SOURCE_FILES})
     add_dependencies(${TEST_PROGRAM} LSMLIB::lsm)
     target_include_directories(${TEST_PROGRAM} PUBLIC ${GTEST_INCLUDE_DIRS})
-    target_link_directories(${TEST_PROGRAM} PUBLIC ${GTEST_LIB_DIRS})
     target_link_libraries(
         ${TEST_PROGRAM}
         PRIVATE lsm
-        gtest
-        gtest_main
+        ${GTEST_LIBRARIES}
+        ${GTEST_MAIN_LIBRARIES}
         ${CMAKE_THREAD_LIBS_INIT}
     )
 endfunction()