def METHOD_NAME(self) -> int:
    from poetry.factory import Factory
    from poetry.pyproject.toml import PyProjectTOML
    # Load poetry config and display errors, if any
    poetry_file = self.poetry.file.path
    config = PyProjectTOML(poetry_file).poetry_config
    check_result = Factory.validate(config, strict=True)
    # Validate trove classifiers
    project_classifiers = set(config.get("classifiers", []))
    errors, warnings = self._validate_classifiers(project_classifiers)
    check_result["errors"].extend(errors)
    check_result["warnings"].extend(warnings)
    # Validate readme (files must exist)
    if "readme" in config:
        errors = self._validate_readme(config["readme"], poetry_file)
        check_result["errors"].extend(errors)
    # Verify that lock file is consistent
    if self.option("lock") and not self.poetry.locker.is_locked():
        check_result["errors"] += ["poetry.lock was not found."]
    if self.poetry.locker.is_locked() and not self.poetry.locker.is_fresh():
        check_result["errors"] += [
            "poetry.lock is not consistent with pyproject.toml. Run `poetry"
            " lock [--no-update]` to fix it."
        ]
    if not check_result["errors"] and not check_result["warnings"]:
        self.info("All set!")
        return 0
    for error in check_result["errors"]:
        self.line_error(f"<error>Error: {error}</error>")
    for error in check_result["warnings"]:
        self.line_error(f"<warning>Warning: {error}</warning>")
    return 1