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23dfb3f899
A pure, offline regex check (no network) so a frozen value object stays pure. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
74 lines
2.1 KiB
Python
74 lines
2.1 KiB
Python
import dataclasses
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import pytest
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from domain.postcode import Postcode
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def test_postcode_uppercases() -> None:
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# act / assert
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assert Postcode("sw1a1aa").value == "SW1A1AA"
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def test_postcode_strips_internal_spaces() -> None:
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# act / assert
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assert Postcode("sw1a 1aa").value == "SW1A1AA"
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def test_postcode_strips_leading_and_trailing_whitespace() -> None:
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# act / assert
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assert Postcode(" sw1a 1aa ").value == "SW1A1AA"
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def test_postcode_strips_tabs_and_newlines() -> None:
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# CSV ingestion occasionally introduces stray whitespace characters; the
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# canonical form must absorb them just like literal spaces.
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# act / assert
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assert Postcode("sw1a\t1aa\n").value == "SW1A1AA"
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def test_postcode_construction_is_idempotent() -> None:
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# arrange
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once = Postcode("sw1a 1aa")
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# act / assert
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assert Postcode(once.value).value == "SW1A1AA"
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def test_postcode_empty_string() -> None:
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# act / assert
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assert Postcode("").value == ""
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def test_postcode_str_returns_canonical_value() -> None:
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# act / assert
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assert str(Postcode("sw1a 1aa")) == "SW1A1AA"
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def test_postcode_equality_ignores_surface_form() -> None:
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# Differing case / whitespace sanitise to the same canonical value, so
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# the value objects compare equal.
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# act / assert
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assert Postcode("sw1a 1aa") == Postcode("SW1A1AA")
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def test_postcode_is_frozen() -> None:
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# arrange
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postcode = Postcode("SW1A1AA")
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# act / assert
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with pytest.raises(dataclasses.FrozenInstanceError):
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postcode.value = "OTHER" # type: ignore[misc]
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@pytest.mark.parametrize(
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"raw",
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["sw1a 1aa", "M1 1AA", "b33 8th", "cr2 6xh", "dn55 1pt", "ec1a 1bb", "w1a 0ax"],
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)
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def test_valid_uk_postcode_formats_are_valid(raw: str) -> None:
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# act / assert — a pure format check on the canonical value, no network.
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assert Postcode(raw).is_valid() is True
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@pytest.mark.parametrize("raw", ["", " ", "NONSENSE", "12345", "SW1A 1A", "ZZ"])
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def test_malformed_or_empty_postcodes_are_invalid(raw: str) -> None:
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# act / assert
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assert Postcode(raw).is_valid() is False
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