[RN] Run ReactCommon C++ unit tests on GitHub CI - #57782
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ReactCommon's C++ unit tests (`<subsystem>/tests/*.cpp`) ship with the repository but were not built or run by CI, so the renderer, layout, and runtime C++ core was only exercised indirectly (integration tests and platform builds). This adds a CMake harness under `private/react-native-tests` that compiles a representative subset of those gtest suites on Linux and runs them with CTest, reusing the desktop C++ toolchain and Gradle-staged third-party dependencies already used by the Fantom tester. A new `test_cxx` GitHub Actions job builds and runs the harness on a standard Linux runner. It currently covers 31 gtest suites (~900 cases) spanning the Fabric renderer, layout, CSS, cxxreact bridge, and bridgeless runtime core; more can be added incrementally (see `private/react-native-tests/README.md`). Compilation is routed through ccache (installed by the action, enabled via `CMAKE_CXX_COMPILER_LAUNCHER`) and the job asserts a nonzero cacheable-call count. The CI job is advisory (`continue-on-error`, bounded by `timeout-minutes`) so a harness issue cannot block merges, and should be promoted to a required check once consistently green. Changelog: [Internal] Test Plan: Runs in the new advisory `test_cxx` CI job on this PR (Linux): builds the CMake harness, runs the 31 gtest suites via CTest, and asserts ccache intercepted compiles. Not built internally per react-native-github build rules (internal builds use Buck, not Gradle).
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Summary
ReactCommon's C++ unit tests (
<subsystem>/tests/*.cpp) ship with the repositorybut were not built or run by CI, so the renderer, layout, and runtime C++ core
was only exercised indirectly (integration tests and platform builds).
This adds a small CMake harness under
private/react-native-teststhat compilesa representative subset of those gtest suites on Linux and runs them with CTest,
reusing the desktop C++ toolchain and Gradle-staged third-party dependencies
already used by the Fantom tester. A new
test_cxxGitHub Actions job builds andruns the harness on a standard Linux runner.
Suites covered initially:
react/renderer/graphics,react/utils,react/renderer/css; more can be added incrementally (seeprivate/react-native-tests/README.md). The CI job is advisory(
continue-on-error) so a harness issue cannot block merges, and should bepromoted to a required check once consistently green.
Test Plan
Runs in the new advisory
test_cxxCI job on this PR (Linux): builds the CMakeharness and runs the gtest suites via CTest.
Changelog: [Internal]