def test_account_irreducible_causes_and_effects():
cause = causal_link(direction=Direction.CAUSE)
effect = causal_link(direction=Direction.EFFECT)
account = models.Account((cause, effect))
assert account.irreducible_causes == (cause, )
assert account.irreducible_effects == (effect, )
def account(links=()):
return models.Account(links)