from pathlib import Path

import pytest

from speccpu import find_build


class TestFindBuild:
    def test_find_build_success(self, tmpdir):
        # Create a mock directory structure with a build directory
        build_parent = Path(tmpdir)
        build_dir = build_parent / "build_2023"
        build_dir.mkdir()

        # Test that find_build correctly identifies the build directory
        found_dir = find_build(build_parent)
        assert found_dir == build_dir

    def test_find_build_multiple_dirs(self, tmpdir):
        # Create multiple build directories
        build_parent = Path(tmpdir)
        build_dir1 = build_parent / "build_2022"
        build_dir2 = build_parent / "build_2023"
        build_dir1.mkdir()
        build_dir2.mkdir()

        # Should find the alphabetically first one
        found_dir = find_build(build_parent)
        assert found_dir == build_dir1

    def test_find_build_no_dir(self, tmpdir):
        # Test the error case when no build directory exists
        build_parent = Path(tmpdir)
        with pytest.raises(RuntimeError):
            find_build(build_parent)