27 lines
585 B
Python
27 lines
585 B
Python
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"""Regression tests for the demo pricing helper."""
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import pytest
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from src.discount import apply_discount
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def test_no_discount_returns_subtotal() -> None:
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assert apply_discount(100.0, 0) == 100.0
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def test_ten_percent_off() -> None:
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assert apply_discount(100.0, 10) == 90.0
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def test_full_discount_is_free() -> None:
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assert apply_discount(59.99, 100) == 0.0
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def test_fractional_rounding() -> None:
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assert apply_discount(19.99, 15) == 16.99
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def test_rejects_out_of_range_percent() -> None:
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with pytest.raises(ValueError):
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apply_discount(10.0, 101)
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