gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
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    "//libcxx/test/selftest/additional_compile_flags/substitutes-in-run.sh.cpp",
    "//libcxx/test/selftest/compile.fail.cpp/compile-error.compile.fail.cpp",
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    "//libcxx/test/selftest/compile.pass.mm/compile-error.compile.pass.mm",
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    "//libcxx/test/selftest/convenience_substitutions/build_run.sh.cpp",
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    "//libcxx/test/selftest/dsl/lit.local.cfg",
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    "//libcxx/test/selftest/file_dependencies/dir/b.txt",
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    "//libcxx/test/selftest/pass.mm/run-error.pass.mm",
    "//libcxx/test/selftest/pass.mm/run-success.pass.mm",
    "//libcxx/test/selftest/pass.mm/use-objective-cxx.pass.mm",
    "//libcxx/test/selftest/remote-substitutions.sh.cpp",
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    "//libcxx/test/selftest/sh.cpp/run-success.sh.cpp",
    "//libcxx/test/selftest/sh.cpp/substitutions.sh.cpp",
    "//libcxx/test/selftest/sh.cpp/werror.sh.cpp",
    "//libcxx/test/selftest/shell-no-escape-builtins.sh.cpp",
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    "//libcxx/test/selftest/test_macros.pass.cpp",
    "//libcxx/test/selftest/tmpdir-exists.sh.cpp",
    "//libcxx/test/selftest/verify.cpp/no-diagnostics-unmarked.verify.cpp",
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    "//libcxx/test/selftest/verify.cpp/right-diagnostic.verify.cpp",
    "//libcxx/test/selftest/verify.cpp/wrong-diagnostic.verify.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": []
}