gn analyze output:
{
  "compile_targets": [],
  "status": "No dependency",
  "test_targets": []
}
gn analyze input:
{
  "files": [
    "//libcxx/include/__format/parser_std_format_spec.h",
    "//libcxx/test/std/containers/container.adaptors/container.adaptors.format/format.functions.tests.h",
    "//libcxx/test/std/containers/sequences/vector.bool/vector.bool.fmt/format.functions.tests.h",
    "//libcxx/test/std/utilities/format/format.range/format.range.fmtmap/format.functions.tests.h",
    "//libcxx/test/std/utilities/format/format.range/format.range.fmtset/format.functions.tests.h",
    "//libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.functions.tests.h",
    "//libcxx/test/std/utilities/format/format.range/format.range.formatter/format.functions.tests.h",
    "//libcxx/test/std/utilities/format/format.tuple/format.functions.tests.h"
  ],
  "test_targets": [
    "//clang-tools-extra/clangd/test:check-clangd",
    "//clang-tools-extra/test:check-clang-tools",
    "//clang/test:check-clang",
    "//lld/test:check-lld",
    "//llvm/test:check-llvm"
  ],
  "additional_compile_targets": []
}
running all tests due to change to blacklisted file