Update CMakeLists to use FetchContent instead of ExternalProject for gtest

Author: balanarayank

tests/CMakeLists.txt

@@ -3,17 +3,17 @@ cmake_minimum_required(VERSION 3.5)
 set(CMAKE_CXX_STANDARD 11)
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads)
-include(ExternalProject)
-set(GTESTINSTALLPATH ${CMAKE_BINARY_DIR}/gtestinstallpath)
-ExternalProject_Add(googletest
-	GIT_REPOSITORY "https://github.com/google/googletest.git"
-	GIT_TAG "release-1.11.0"
-	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${GTESTINSTALLPATH}
+
+#googletest
+include(FetchContent)
+FetchContent_Declare(googletest
+GIT_REPOSITORY "https://github.com/google/googletest.git"
+GIT_TAG "release-1.11.0"
 )
-include_directories(${GTESTINSTALLPATH}/include ${CMAKE_CURRENT_SOURCE_DIR}/../src)
-link_directories(${GTESTINSTALLPATH}/lib)
-set(UT_CPP_SOURCES main_ut.cc SinglyLinkedList/SinglyLinkedList_ut.h)
-add_executable(${PROJECT_NAME} ${UT_CPP_SOURCES})
-add_dependencies(${PROJECT_NAME} googletest)
-target_link_libraries(${PROJECT_NAME} gtest gtest_main gmock gmock_main Threads::Threads)
+FetchContent_MakeAvailable(googletest)
 
+set(UT_CPP_SOURCES main_ut.cc)
+
+add_executable(${PROJECT_NAME} ${UT_CPP_SOURCES})	
+target_include_directories(${PROJECT_NAME} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src)
+target_link_libraries(${PROJECT_NAME} gtest gtest_main gmock gmock_main Threads::Threads)