import csv

from src.generate_data import generate_data


def test_record_count_and_header(tmp_path):
    path = tmp_path / "orders.csv"
    generate_data(path)
    with path.open(encoding="utf-8", newline="") as source:
        records = csv.reader(source)
        assert next(records) == ["order_id", "order_date", "category", "quantity", "unit_price"]
        assert sum(1 for _ in records) == 1500


def test_repeated_generation_is_byte_identical(tmp_path):
    path = tmp_path / "orders.csv"
    generate_data(path)
    first_run = path.read_bytes()
    generate_data(path)
    assert path.read_bytes() == first_run