gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//.github/workflows/libcxx-pr-conformance-tests.yaml",
    "//libcxx/test/CMakeLists.txt",
    "//libcxx/test/benchmarks/CMakeLists.txt",
    "//libcxx/test/benchmarks/containers/string.bench.cpp",
    "//libcxx/test/benchmarks/lit.local.cfg",
    "//libcxx/test/configs/harness-configuration.cfg.in",
    "//libcxx/utils/libcxx/test/config.py",
    "//libcxx/utils/libcxx/test/format.py",
    "//libcxx/utils/libcxx/test/googlebenchmark.py",
    "//libcxxabi/test/configs/cmake-bridge.cfg.in",
    "//libunwind/test/configs/cmake-bridge.cfg.in"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//compiler-rt/test/hwasan:check-hwasan",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}