def test_is_utility_enhancing_uninitialized():
"""Test is_utility_enhancing when the states are uninitialized."""
ownership_state = OwnershipState()
preferences = Preferences()
terms = Terms(
ledger_id="ethereum",
sender_address="agent_1",
counterparty_address="pk",
amount_by_currency_id={"FET": -20},
is_sender_payable_tx_fee=True,
quantities_by_good_id={"good_id": 10},
nonce="transaction nonce",
)
assert preferences.is_utility_enhancing(
ownership_state=ownership_state,
terms=terms), "Should enhance utility."
def test_score_diff_from_transaction():
"""Test the difference between the scores."""
good_holdings = {"good_id": 2}
currency_holdings = {"FET": 100}
utility_params = {"good_id": 20.0}
exchange_params = {"FET": 10.0}
ownership_state = OwnershipState()
ownership_state.set(
amount_by_currency_id=currency_holdings, quantities_by_good_id=good_holdings
)
preferences = Preferences()
preferences.set(
utility_params_by_good_id=utility_params,
exchange_params_by_currency_id=exchange_params,
)
terms = Terms(
ledger_id=ETHEREUM,
sender_address="agent_1",
counterparty_address="pk",
amount_by_currency_id={"FET": -20},
is_sender_payable_tx_fee=True,
quantities_by_good_id={"good_id": 10},
nonce="transaction nonce",
)
cur_score = preferences.utility(
quantities_by_good_id=good_holdings, amount_by_currency_id=currency_holdings
)
new_state = ownership_state.apply_transactions([terms])
new_score = preferences.utility(
quantities_by_good_id=new_state.quantities_by_good_id,
amount_by_currency_id=new_state.amount_by_currency_id,
)
diff_scores = new_score - cur_score
score_difference = preferences.utility_diff_from_transaction(
ownership_state=ownership_state, terms=terms
)
assert (
score_difference == diff_scores
), "The calculated difference must be equal to the return difference from the function."
assert not preferences.is_utility_enhancing(
ownership_state=ownership_state, terms=terms
), "Should not enhance utility."