Repository: pytest-dev/pytest
File: src/_pytest/config/findpaths.py (Python)

Code before:
        else:
            import tomli as tomllib

        toml_text = filepath.read_text(encoding="utf-8")
        try:
            config = tomllib.loads(toml_text)
        except tomllib.TOMLDecodeError as exc:
            raise UsageError(f"{filepath}: {exc}") from exc

        result = config.get("tool", {}).get("pytest", {}).get("ini_options", None)
        if result is not None:
            # TOML supports richer data types than ini files (strings, arrays, floats, ints, etc),
            # however we need to convert all scalar values to str for compatibility with the rest
            # of the configuration system, which expects strings only.
            def make_scalar(v: object) -> str | list[str]:
                return v if isinstance(v, list) else str(v)

            return {k: make_scalar(v) for k, v in result.items()}

    return None


def locate_config(
    invocation_dir: Path,
    args: Iterable[Path],
) -> tuple[Path | None, Path | None, ConfigDict, list[str]]:
    """Search in the list of arguments for a valid ini-file for pytest,
    and return a tuple of (rootdir, inifile, cfg-dict)."""
    config_names = [
        "pytest.ini",
        ".pytest.ini",
        "pyproject.toml",
        "tox.ini",
        "setup.cfg",
    ]
    args = [x for x in args if not str(x).startswith("-")]
    if not args:
        args = [invocation_dir]
    found_pyproject_toml: Path | None = None
    ignored_config_files: list[str] = []

    for arg in args:
        argpath = absolutepath(arg)
        for base in (argpath, *argpath.parents):
            for config_name in config_names:
                p = base / config_name
                if p.is_file():
                    if p.name == "pyproject.toml" and found_pyproject_toml is None:
                        found_pyproject_toml = p
                    ini_config = load_config_dict_from_file(p)
                    if ini_config is not None:

Review comment (suggestion):
Let's promise to return a read-only sequence.

```suggestion
) -> tuple[Path | None, Path | None, ConfigDict, Sequence[str]]:
```

Code after:
        else:
            import tomli as tomllib

        toml_text = filepath.read_text(encoding="utf-8")
        try:
            config = tomllib.loads(toml_text)
        except tomllib.TOMLDecodeError as exc:
            raise UsageError(f"{filepath}: {exc}") from exc

        result = config.get("tool", {}).get("pytest", {}).get("ini_options", None)
        if result is not None:
            # TOML supports richer data types than ini files (strings, arrays, floats, ints, etc),
            # however we need to convert all scalar values to str for compatibility with the rest
            # of the configuration system, which expects strings only.
            def make_scalar(v: object) -> str | list[str]:
                return v if isinstance(v, list) else str(v)

            return {k: make_scalar(v) for k, v in result.items()}

    return None


def locate_config(
    invocation_dir: Path,
    args: Iterable[Path],
) -> tuple[Path | None, Path | None, ConfigDict, Sequence[str]]:
    """Search in the list of arguments for a valid ini-file for pytest,
    and return a tuple of (rootdir, inifile, cfg-dict, ignored-config-files), where
    ignored-config-files is a list of config basenames found that contain
    pytest configuration but were ignored."""
    config_names = [
        "pytest.ini",
        ".pytest.ini",
        "pyproject.toml",
        "tox.ini",
        "setup.cfg",
    ]
    args = [x for x in args if not str(x).startswith("-")]
    if not args:
        args = [invocation_dir]
    found_pyproject_toml: Path | None = None
    ignored_config_files: list[str] = []

    for arg in args:
        argpath = absolutepath(arg)
        for base in (argpath, *argpath.parents):
            for config_name in config_names:
                p = base / config_name
                if p.is_file():
                    if p.name == "pyproject.toml" and found_pyproject_toml is None:
                        found_pyproject_toml = p