gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/string",
    "//libcxx/test/extensions/libcxx/localization/lit.local.cfg",
    "//libcxx/test/extensions/libcxx/localization/locale.convenience/conversions/conversions.string/ctor_move.pass.cpp",
    "//libcxx/test/std/numerics/c.math/fdelayed-template-parsing.pass.cpp",
    "//libcxx/test/std/numerics/rand/rand.req/rand.req.urng/valid_int_type.verify.cpp",
    "//libcxx/test/std/numerics/rand/rand.req/rand.req.urng/valid_real_type.verify.cpp",
    "//libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/shared_ptr_array.pass.cpp"
  ],
  "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": []
}