[Test] (BufferTest): add Binding test, and fix compile errors

MobileGL/MG_Test/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.14)
 project(MobileGLTest)
 
 # GoogleTest requires at least C++17
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 include(FetchContent)
@@ -15,6 +15,9 @@ set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
 FetchContent_MakeAvailable(googletest)
 
 enable_testing()
+
+set(MGL_ROOT ${CMAKE_CURRENT_LIST_DIR}/../..)
+
 add_executable(
   SanityTest
   SanityTest.cpp
@@ -25,4 +28,6 @@ target_link_libraries(
 )
 
 include(GoogleTest)
-gtest_discover_tests(SanityTest)
+gtest_discover_tests(SanityTest)
+
+add_subdirectory(Buffer)