These tests validate that a Nim FFI library exported with nim-ffi's C++ codegen is usable from a real C++ consumer. They drive the my_timer example through its auto-generated my_timer.hpp bindings (constructor, sync method, async methods, complex types with optional fields, multiple contexts) and assert the round-tripped values.

Layout

The suite reuses the generated bindings instead of duplicating the Nim build glue:

CMakeLists.txt — add_subdirectorys examples/timer/cpp_bindings, which compiles libmy_timer and exposes the my_timer_headers INTERFACE target. Fetches GoogleTest and registers tests with CTest via gtest_discover_tests.
test_timer_e2e.cpp — the test cases.

Running

# 1. Generate the C++ bindings (writes examples/timer/cpp_bindings/)
nimble genbindings_cpp

# 2. Configure + build + run the tests
cmake -S tests/e2e/cpp -B tests/e2e/cpp/build
cmake --build tests/e2e/cpp/build
ctest --test-dir tests/e2e/cpp/build --output-on-failure