def test_hwep__zeros():
assert np.isnan(hwep(0, 0, 0))
def test_hwep__pass():
# These seemingly arbitrary arguments trigger separate conditional
# branches based on odd/even midpoints in the Levene-Haldane distribution
assert not np.isnan(hwep(1, 1, 1))
assert not np.isnan(hwep(1, 2, 2))
def test_hwep__raise_on_negative(args):
with pytest.raises(ValueError):
hwep(*args)