from src.u6_tests.pricing import discount_price


def test_discount_price_reduces_price():
    result = discount_price(100.0, 20.0)
    assert result == 80.0


def test_discount_price_negative_discount():
    try:
        discount_price(100.0, -20.0)
        assert False, "Expected ValueError"
    except ValueError as e:
        assert str(e) == "Discount percent cannot be negative"