from pathlib import Path
from src.final_report_builder import FinalReportBuilder
def test_empty_final_report_exports(tmp_path:Path)->None:
    b=FinalReportBuilder();r=b.build(tmp_path);assert "因果関係" in r.limitations;paths=b.export(r,tmp_path/"r.md",tmp_path/"r.csv");assert paths[1].read_bytes().startswith(b"\xef\xbb\xbf")