Add arena allocator

CMakeLists.txt

@@ -22,9 +22,24 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(toml11)
 
+FetchContent_Declare(
+  doctest
+  GIT_REPOSITORY https://github.com/doctest/doctest.git
+  GIT_TAG 1da23a3e8119ec5cce4f9388e91b065e20bf06f5 # v2.4.12
+)
+FetchContent_MakeAvailable(doctest)
+
 include_directories(src)
 
 set(SOURCES src/main.cpp src/config.cpp)
 
 add_executable(weaseldb ${SOURCES})
 target_link_libraries(weaseldb Threads::Threads toml11::toml11)
+
+enable_testing()
+
+add_executable(test_arena_allocator tests/test_arena_allocator.cpp)
+target_link_libraries(test_arena_allocator doctest::doctest)
+target_include_directories(test_arena_allocator PRIVATE src)
+
+add_test(NAME arena_allocator_tests COMMAND test_arena_allocator)