'Create a LogUnit subclass using the callable unit and physical unit,
and do basic check that output is right.'

@pytest.mark.parametrize(u'lu_unit,    physical_unit', itertools.product(lu_units, pu_sample))
def test_call_units(self, lu_unit, physical_unit):

    lu1 = lu_unit(physical_unit)
    assert (lu1.physical_unit == physical_unit)
    assert (lu1.function_unit == lu1._default_function_unit)
