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# SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
# SPDX-License-Identifier: BSD-2-Clause
"""Test the second task in Perl weekly challenge 285, "Making Change"."""
from __future__ import annotations
import dataclasses
import pytest
from perl_weekly_285 import change
@dataclasses.dataclass(frozen=True)
class BreakDownWaysCase:
"""A test case for the "No Connection" task."""
amount: int
"""The amount to break down."""
highest: change.Coin
"""The highest coin to use for this amount."""
expected: list[tuple[int, change.Coin]]
"""The ways to break this amount down into smaller chunks."""
@pytest.mark.parametrize(
"tcase",
[
BreakDownWaysCase(amount=1, highest=change.Coin.HALF_DOLLAR, expected=[]),
BreakDownWaysCase(amount=2, highest=change.Coin.HALF_DOLLAR, expected=[]),
BreakDownWaysCase(
amount=6,
highest=change.Coin.HALF_DOLLAR,
expected=[(1, change.Coin.PENNY)],
),
BreakDownWaysCase(amount=6, highest=change.Coin.NICKEL, expected=[(1, change.Coin.PENNY)]),
BreakDownWaysCase(amount=6, highest=change.Coin.PENNY, expected=[]),
BreakDownWaysCase(
amount=7,
highest=change.Coin.HALF_DOLLAR,
expected=[(2, change.Coin.PENNY)],
),
BreakDownWaysCase(amount=7, highest=change.Coin.NICKEL, expected=[(2, change.Coin.PENNY)]),
BreakDownWaysCase(amount=7, highest=change.Coin.PENNY, expected=[]),
BreakDownWaysCase(
amount=10,
highest=change.Coin.HALF_DOLLAR,
expected=[(0, change.Coin.NICKEL), (5, change.Coin.PENNY), (0, change.Coin.PENNY)],
),
BreakDownWaysCase(
amount=10,
highest=change.Coin.DIME,
expected=[(0, change.Coin.NICKEL), (5, change.Coin.PENNY), (0, change.Coin.PENNY)],
),
BreakDownWaysCase(
amount=10,
highest=change.Coin.NICKEL,
expected=[(5, change.Coin.PENNY), (0, change.Coin.PENNY)],
),
BreakDownWaysCase(amount=10, highest=change.Coin.PENNY, expected=[]),
BreakDownWaysCase(
amount=12,
highest=change.Coin.HALF_DOLLAR,
expected=[(2, change.Coin.NICKEL), (7, change.Coin.PENNY), (2, change.Coin.PENNY)],
),
BreakDownWaysCase(
amount=12,
highest=change.Coin.DIME,
expected=[(2, change.Coin.NICKEL), (7, change.Coin.PENNY), (2, change.Coin.PENNY)],
),
BreakDownWaysCase(
amount=12,
highest=change.Coin.NICKEL,
expected=[(7, change.Coin.PENNY), (2, change.Coin.PENNY)],
),
BreakDownWaysCase(amount=12, highest=change.Coin.PENNY, expected=[]),
BreakDownWaysCase(
amount=15,
highest=change.Coin.HALF_DOLLAR,
expected=[
(5, change.Coin.NICKEL),
(10, change.Coin.PENNY),
(5, change.Coin.PENNY),
(0, change.Coin.PENNY),
],
),
BreakDownWaysCase(
amount=15,
highest=change.Coin.DIME,
expected=[
(5, change.Coin.NICKEL),
(10, change.Coin.PENNY),
(5, change.Coin.PENNY),
(0, change.Coin.PENNY),
],
),
BreakDownWaysCase(
amount=15,
highest=change.Coin.NICKEL,
expected=[(10, change.Coin.PENNY), (5, change.Coin.PENNY), (0, change.Coin.PENNY)],
),
BreakDownWaysCase(amount=15, highest=change.Coin.PENNY, expected=[]),
],
)
def test_break_down_ways(*, tcase: BreakDownWaysCase) -> None:
"""Make sure we can find the leaf destination."""
assert change.break_down_ways(tcase.amount, tcase.highest) == tcase.expected
@dataclasses.dataclass(frozen=True)
class MakeChangeCase:
"""A test case for the actual "how many ways can we break this down" function."""
amount: int
"""The amount to break down."""
expected: int
"""The expected number of ways."""
@pytest.mark.parametrize(
"tcase",
[
MakeChangeCase(amount=9, expected=2),
MakeChangeCase(amount=15, expected=6),
MakeChangeCase(amount=100, expected=292),
],
)
def test_make_change(tcase: MakeChangeCase) -> None:
"""Make sure we can count the ways."""
assert change.solve_making_change(tcase.amount) == tcase.expected
|
