'contract',

    'invoice',

    'purchase-order',

    'receipt',

    'statement',

])

class Account(str):

    """Account name string

    This is a string that names an account, like Accrued:AccountsPayable

    or Income:Donations. This class provides additional methods for common

    account name parsing and queries.

    """

    SEP = bc_account.sep

    def is_income(self) -> bool:

        return self.is_under('Income:', 'UnearnedIncome:') is not None

    def is_real_asset(self) -> bool:

        return bool(

            self.is_under('Assets:')

            and not self.is_under('Assets:PrepaidExpenses', 'Assets:PrepaidVacation')

        )

    def is_under(self, *acct_seq: str) -> Optional[str]:

        """Return a match if this account is "under" a part of the hierarchy

        Pass in any number of account name strings as arguments. If this

        account is under one of those strings in the account hierarchy, the

        first matching string will be returned. Otherwise, None is returned.

def test_is_income(acct_name, expected):

    assert data.Account(acct_name).is_income() == expected

@pytest.mark.parametrize('acct_name,expected', [

    ('Accrued:AccountsPayable', False),

    ('Accrued:AccountsReceivable', False),

    ('Assets:Cash', True),

    ('Assets:Cash:EUR', True),

    ('Assets:PrepaidExpenses', False),

    ('Assets:PrepaidVacation', False),

    ('Assets:Bank:Checking', True),

    ('Expenses:General', False),

    ('Income:Donations', False),

])

def test_is_real_asset(acct_name, expected):

    assert data.Account(acct_name).is_real_asset() == expected