.build_posting(Account::try_from("Assets:Investment").unwrap(), |posting| {
                    posting.set_amount(Amount::new(dec!(-3000.00), commodity));
                })

assertion_line: 57

  Assets:Investment      - 3,000.00 EUR

    pub sign_column: usize,

        let sign_column = start_column;

        let decimal_separator_column = start_column + left_width;

        let decimal_separator_column = sign_column + left_width;

            sign_column,

impl Default for AmountConfig {
    fn default() -> Self {
        Self {
            decimal_separator_column: 110,
            commodity_column: 116,
        }
    }
}

impl Default for Config {
    fn default() -> Self {
        Self {
            account_column: 2,
            amount: Default::default(),
            flag_column: 2,
        }
    }
}

        self.print_decimal_aligned(config.decimal_separator_column, amount)?;

        self.print_decimal_aligned(config.sign_column, config.decimal_separator_column, amount)?;

        sign_column: usize,

        let decimal = fixed_decimal_from(decimal);

        self.inner.ensure_column(sign_column)?;
        self.inner.write_all(if decimal.is_sign_negative() {
            b"-"
        } else {
            b" "
        })?;
        // Ensure decimal is now positive
        let decimal = decimal.abs();
        let decimal = fixed_decimal_from(&decimal);

            flag: _,

            flag,

        if let Some(flag) = flag {
            write!(self.inner, "{flag} ")?;
        }