backend/tests/test_postcodes.py

"""Postcode regex tests — spec section 6.1 case 2."""

from __future__ import annotations

import pytest

from app.postcodes import is_ni_postcode


@pytest.mark.parametrize(
    "value",
    [
        "BT1 5GS",
        "BT9 7AG",
        "BT15 4ET",
        "BT38 8QB",
        "bt11 9aa",
    ],
)
def test_ni_postcodes_accepted(value: str) -> None:
    assert is_ni_postcode(value)


@pytest.mark.parametrize(
    "value",
    [
        "SW1A 1AA",  # English
        "EC1A 1BB",  # London
        "G1 1AA",  # Glasgow
        "M1 1AA",  # Manchester
        "BT",  # too short
        "BT999 1AB",  # too high
        "INVALID",
        "",
    ],
)
def test_non_ni_postcodes_rejected(value: str) -> None:
    assert not is_ni_postcode(value)