from packages.domain import option_leverage


def test_leverage_basic():
    assert option_leverage(2000.0, 20.0) == 100.0
    assert option_leverage(3500.0, 35.0) == 100.0


def test_leverage_invalid():
    assert option_leverage(0, 10) is None
    assert option_leverage(100, 0) is None
    assert option_leverage(100, None) is None
    assert option_leverage(-1, 1) is None