import pytest

from hdbscan._prediction_utils import safe_always_positive_division


@pytest.mark.parametrize('denominator', [-1, 0, 1])
def test_safe_always_positive_division(denominator):
    numerator = 1
    # Given negative, zero and positive denominator and positive numerator
    value = safe_always_positive_division(numerator, 0)
    # Make sure safe division is always positive and doesn't raise ZeroDivision error
    assert value >= 0