import pytest

from briefcase.exceptions import BriefcaseCommandError


def test_no_pyproject_file(convert_command):
    """If there is no pyproject.toml file, a BriefcaseCommandError is raised."""
    with pytest.raises(BriefcaseCommandError):
        convert_command.validate_pyproject_file()


def test_briefcase_field_present(convert_command):
    """If the project is already set up for Briefcase, a BriefcaseCommandError is
    raised."""
    (convert_command.base_path / "pyproject.toml").write_text(
        "[tool.briefcase]\n", encoding="utf-8"
    )
    with pytest.raises(BriefcaseCommandError):
        convert_command.validate_pyproject_file()


def test_no_briefcase_field(convert_command):
    """If the project has a pyproject.toml file and is not already set up for Briefcase,
    no error is raised."""
    (convert_command.base_path / "pyproject.toml").write_text(
        "[project]\n", encoding="utf-8"
    )
    convert_command.validate_pyproject_file()