Fetch GTest if GTest package not found

Author: kzhdev

CMakeLists.txt

@@ -74,7 +74,6 @@ endif()
 # Tests
 option(BUILD_SLICK_SOCKET_TESTING "Build tests" ON)
 if(BUILD_SLICK_SOCKET_TESTING)
-  find_package(GTest CONFIG REQUIRED)
   enable_testing()
   add_subdirectory(tests)
 endif()

tests/CMakeLists.txt

@@ -1,5 +1,18 @@
 # Tests CMakeLists.txt
 
+find_package(GTest CONFIG REQUIRED)
+
+if(NOT GTest_FOUND)
+  include(FetchContent)
+  FetchContent_Declare(
+    googletest
+    URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+  )
+  # For Windows: Prevent overriding the parent project's compiler/linker settings
+  set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+  FetchContent_MakeAvailable(googletest)
+endif()
+
 # Include Google Test
 include(GoogleTest)