payslip-ingest/tests/test_tax_year.py

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from datetime import date
import pytest
from payslip_ingest.tax_year import derive_tax_year
@pytest.mark.parametrize(
("pay_date", "expected"),
[
(date(2025, 4, 5), "2024/25"),
(date(2025, 4, 6), "2025/26"),
(date(2026, 4, 5), "2025/26"),
(date(2026, 4, 6), "2026/27"),
(date(2026, 12, 31), "2026/27"),
(date(2027, 1, 1), "2026/27"),
(date(2027, 4, 5), "2026/27"),
(date(2027, 4, 6), "2027/28"),
],
)
def test_derive_tax_year(pay_date: date, expected: str) -> None:
assert derive_tax_year(pay_date) == expected