fixes:

1. make building tests optional
2. use system wide GTest
3. fix -Werror=array-bounds= compile error

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 55f1a6df..fcfa593a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,10 @@ set(CMAKE_VERBOSE_MAKEFILE on)
 include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/project-defaults.cmake)
 
 add_subdirectory(yoga)
-add_subdirectory(tests)
+option(BUILD_TESTS "Build tests" ON)
+if(BUILD_TESTS)
+    add_subdirectory(tests)
+endif()
 
 option(BUILD_FUZZ_TESTS "Build fuzz tests" OFF)
 
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c48bfb9f..fbf837f6 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -8,18 +8,13 @@ cmake_minimum_required(VERSION 3.13...3.26)
 project(tests)
 set(CMAKE_VERBOSE_MAKEFILE on)
 
-include(FetchContent)
 include(GoogleTest)
+find_package(GTest REQUIRED)
 
 set(YOGA_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/..)
 include(${YOGA_ROOT}/cmake/project-defaults.cmake)
 
 # Fetch GTest
-FetchContent_Declare(
-  googletest
-  URL https://github.com/google/googletest/archive/refs/tags/release-1.12.1.zip
-)
-FetchContent_MakeAvailable(googletest)
 
 add_subdirectory(${YOGA_ROOT}/yoga ${CMAKE_CURRENT_BINARY_DIR}/yoga)
 
diff --git a/tests/YGPersistenceTest.cpp b/tests/YGPersistenceTest.cpp
index 929aee07..f171e5f7 100644
--- a/tests/YGPersistenceTest.cpp
+++ b/tests/YGPersistenceTest.cpp
@@ -275,7 +275,7 @@ TEST(YogaTest, mixed_shared_and_owned_children) {
   YGNodeInsertChild(root1, root1_child2, 1);
 
   auto children = static_cast<yoga::Node*>(root1)->getChildren();
-  children.insert(children.begin() + 1, static_cast<yoga::Node*>(root0_child0));
+  children.emplace(children.begin() + 1, static_cast<yoga::Node*>(root0_child0));
   static_cast<yoga::Node*>(root1)->setChildren(children);
 
   auto secondChild = YGNodeGetChild(root1, 1);