Add test for releasing connections back to the server

CMakeLists.txt

@@ -178,6 +178,30 @@ target_include_directories(test_http_handler PRIVATE src)
 target_compile_definitions(test_http_handler
                            PRIVATE DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN)
 
+add_executable(
+  test_server_connection_return
+  tests/test_server_connection_return.cpp
+  src/server.cpp
+  src/connection.cpp
+  src/connection_registry.cpp
+  src/arena_allocator.cpp
+  src/config.cpp
+  src/http_handler.cpp
+  ${CMAKE_BINARY_DIR}/json_tokens.cpp)
+add_dependencies(test_server_connection_return generate_json_tokens)
+target_link_libraries(
+  test_server_connection_return
+  doctest::doctest
+  llhttp_static
+  Threads::Threads
+  toml11::toml11
+  perfetto
+  weaseljson
+  simdutf::simdutf)
+target_include_directories(test_server_connection_return PRIVATE src)
+target_compile_definitions(test_server_connection_return
+                           PRIVATE DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN)
+
 add_executable(bench_arena_allocator benchmarks/bench_arena_allocator.cpp
                                      src/arena_allocator.cpp)
 target_link_libraries(bench_arena_allocator nanobench)
@@ -218,6 +242,8 @@ add_test(NAME arena_allocator_tests COMMAND test_arena_allocator)
 add_test(NAME connection_registry_tests COMMAND test_connection_registry)
 add_test(NAME commit_request_tests COMMAND test_commit_request)
 add_test(NAME http_handler_tests COMMAND test_http_handler)
+add_test(NAME server_connection_return_tests
+         COMMAND test_server_connection_return)
 add_test(NAME arena_allocator_benchmarks COMMAND bench_arena_allocator)
 add_test(NAME commit_request_benchmarks COMMAND bench_commit_request)
 add_test(NAME parser_comparison_benchmarks COMMAND bench_parser_comparison)